Malicious PDF — malware analysis report

Static analysis result for SHA-256 357a5f858f9c8691…

MALICIOUS

PDF

84.2 KB Created: 2021-07-03 18:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5c925069d4566b0d5c9649e73e16ca8 SHA-1: 0c2ea6126bcfc173fb39332cec6cbccdc5b4617b SHA-256: 357a5f858f9c8691312742183d61a273109a27b3bf72aa9518a6a0ce4ef71a31
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous heuristic firings related to external URL links, including those hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of many links to potentially malicious PDF files suggests the document's purpose is to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://t-p-fortune.com/userfiles/file/nudutudi.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609564074cc31---94906718121.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/rotagalipe.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/0a2ev30mop59ena53jat8gajcv/92554034421.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2veugho1oce5vcfb2vrqa1gk3h/86064930499.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/fawaxi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a322ba989a67e3ca97d5e1d6c3cbc539/3743772381.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096f06c06d8c---47837123894.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/41609308153.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815a34934a6---sisekitizibi.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/posevisizipubevabatuke.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/29fcc7bc3902d70fe069c20d97215eac/2930031817.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160711405363a4---68144628537.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/xasazudegusaxivexabula.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/rusanojuvirafumokarixudu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedf179b44---kagidonuganumibiviwe.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/13413242280.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210703140129.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/49618501d74374c70e9449e456b28d09/62258289032.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6hb1e9s712s9o3f7dvmbsodn97/11748052495.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5664f97da161a8f85c7e458e77dbe7ad/gezadibuderifetaviziju.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ceb63267e---66665747440.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/95032290809.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4810ae9b---98054780985.pdfIn PDF document text
    • http://stylekd.ru/files/zaribudepolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+text+underlined+in+htmlPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 10716 bytes
SHA-256: 5ac0674acc0445fcb7cbfd711b045e36ee06151e0a63dca3b8e69b05f25b9c22
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 17760 bytes
SHA-256: 1ad62d1e263b6a70503628a758686ece768c2250272970bafd8d0eee16980e55

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