Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d5fa9f30c598fa…

MALICIOUS

PDF

90.1 KB Created: 2021-07-02 12:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9082ac03156e284d423dc4dff3a817e0 SHA-1: 87e54489643f465202c8bc19acaa66c433902250 SHA-256: 87d5fa9f30c598fa171f604dff8d723f1389782392cbc5ea1318ab08cc87587b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://albino-pitti.com/pub_img/file/94361717690.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad3d51aee---sadenutikakapif.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/kukavebaxijeturedeso.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/rukibubevud.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/rabil.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/62984399550.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/34336124263.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/vuwilanasa.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0790096965bb8765a7dc96e57252e0f0/bibusavotexowonujadoj.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecba15d942---59032792559.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb2ff0486---60610086465.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/wafisivewerizako.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/netoxavanisike.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700616ec994---11586974409.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/egvde0c7ipg8pu8tgnfeegr34r/bemeg.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e3ef9b0f5---57189610473.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/433d68d6ee56ce3552c7f33bb4dca4c2/66420022440.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/74832649594.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/70783406208.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/32388101864.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609422b1279ac---fijalapa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09bd2633e5---23035721146.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/gudulukamosaregob.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/10c3702ccb26582c9f57f40fa79cd999/mipipuvasodazemejufigane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ring+tailed+lemur+weightPDF 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_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 10640 bytes
SHA-256: 81cdc3fa1fbaa787bad42e7d59a79ab6b0999830c363ecb97cf52904c53c286a
font_01_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 17076 bytes
SHA-256: 5729118270f0ff2087fafd519259baa219a3d53ce9d73048850cf60f9b838eca
font_02_sfnt_off0001432b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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