Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f6dffe8dcf445c…

MALICIOUS

PDF

88.2 KB Created: 2021-07-18 01:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68b2805b76a3b1ab660eca58e263f753 SHA-1: 39bf3f0479a19135eb2f2ff4c094b8961f5e576c SHA-256: 73f6dffe8dcf445c7162bdd39c2db76510ef6b225c84f0310abd01cd9d4bdd90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The presence of embedded URLs and the PDF_URI heuristics confirm the attempt to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://suseefinance.com/userfiles/file/mititiwijutogiwowo.pdf In PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f524de1afd---ruvebeganivomurel.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22ef37ae1---mizatovopijebu.pdfIn PDF document text
    • http://poorclarescork.ie/images/vixopogidusanovugijezu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/kuvosuwe.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/duvopoxekoxuledego.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/53587726597.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28277449098.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/98c57c4ebd199b729513afdad1467b0b/10593337236.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28221523fc---47915468787.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/13627995459.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/53999430067.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xodotosuxutubugogonajitor.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f41633d2---60479476850.pdfPDF link annotation
    • http://watthaistuttgart.de/userfiles/file/dofipelagepovesajese.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/97965282709.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/64316337486.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/sujezerewezenujitepezo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/46088917947.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/ruzugod.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c92d08264400ce8ac3447b8a943a43d7/mitofifomorinenajulajuraw.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c281cd592---75265512556.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/dfd350af6d1d4e78bc594d76de6760b1/19043584641.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d2c8a2d3cc3004fa4470d8b4b949d6a7/topitogiperimolapunamoxam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+height+of+a+randomly+selected+studentPDF 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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 17584 bytes
SHA-256: 38305b4814a7779e988c90221f2bcdae74ffdce0b65c496cd13400f215700995
font_01_sfnt_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E4 11100 bytes
SHA-256: e6b4574c3cc7a6cd3ed7f27c8f6fecfaf90a5e27194798cf56b7262f8f0724bd

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