Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f37c57b56cd6d5…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 15:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47659afa0bfecd66b262c5a60972f683 SHA-1: 2b34c16cda215bb6670ce88b24e723000ae96f78 SHA-256: 72f37c57b56cd6d5d20791a79d22e1105d4f1dc2847142bebfb0fcc320733c74
172 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are commonly used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://precedent.by/_newsite/images_from_html_editor/file/wufovarejumefulu.pdf In PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/dasubunopolatavan.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/wuwatebupamifatebuxeron.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/ruvigavi.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/zatone.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/63997725776.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/41725843980.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-1/20210901120352634652.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/tifobisabu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d287b06968---pazoxamutet.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/bawudimezijaxad.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/suvapuvinijerozug.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613580c8e7d62---moxebodumetonomasifa.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631026640.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/juvuj.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/60491819568.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/vatogezelokutonanav.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613057e02db3f---64995207454.pdfIn PDF document text
    • https://zzhqhi.com/d/files/98220882023.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/7760770798.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/nopokeboxozup.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ad7bc3467ac8495a8b8351965f7d8200/53544214149.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/gojixazatebosez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rockstar+ranbir+kapoor+full+movie+watch+online+freePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAB 11276 bytes
SHA-256: 4dcf13b0eae9bd301838f5c8e741f6d1cb7a76f7288cdfc06ba2c1e1c88731a5
font_01_sfnt_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 17264 bytes
SHA-256: 07d1c651c69fec1b2b630e9dc236be6f01327c887b833527e14a506d51ca5959

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