Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50f3a5045c01a53…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 03:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8b10f206f113ea13971605279133ed6 SHA-1: 00ee024a9c14c10b99dc1a310cc011916a74ec1b SHA-256: d50f3a5045c01a535863a6cab84eafdba4dbbbb0124ac29d3823a8656ce7bacd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the nature of the link farm and the detection as a Trojan indicate a high likelihood of malicious intent, possibly involving the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a688b208bfa---91213050020.pdf In PDF document text
    • https://fotofidelity.cz/userfiles/file/nodexuvipofowomubud.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bc0770bb---85790840632.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5d5393c42eebc3da187ec040d97cc288/navop.pdfIn PDF document text
    • https://corghialberti.it/file/58460842214.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4437bc678003a2c2e39cbd7b3acf2a72/46075697440.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c56b6004b7---narosiraxuworusop.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c2237eed8b01a09c888f262c7d67150c/7838884627.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160752b96c84f8---laxuvazised.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071915699ed5---zaguke.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074485d6a3cd---zipusuzamagudirevame.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/xemakixelajudigulala.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c488d047197---novitiw.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/kerufijimazawomob.pdfIn PDF document text
    • http://thaide.org/userfiles/file/85144053853.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930544d8985---21259126153.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4ec98d205d97f6cdb660520c6a0af882/jigobipuzafelaje.pdfIn PDF document text
    • http://ezibra.pl/upload//file/fepixo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078af6295c5a---28896969713.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/watumubuxavasixojefiwoso.pdfIn PDF document text
    • http://asustainable.com/global/file/11738101545.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31055dfd5---bexagufufiwejekiwa.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898e29a0944---97146652058.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b89bb0f6---porunepizubuliz.pdfIn PDF document text
    • http://airfa.it/userfiles/file/48694509449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=embassy+contact+numberPDF 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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 17636 bytes
SHA-256: b52d45ba79911d2efd09328691f266fe09b0e785c818b23f77f63d7aa8212120
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 10588 bytes
SHA-256: 9d19834e6b751be59effd4399731bba7aad6dd28453cad28c80b7d7180e55749
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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