Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4fa9dc708ed5b0…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 11:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fa21dcfc16e43fd746fdee996432e0d SHA-1: 1e2c0f9e0069071b4f243d97f9469f30d27b2503 SHA-256: 4c4fa9dc708ed5b0059e8290cba215e7659b2d17628ab81a09c47002962727c2
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely intended to host malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the link farm suggest an attempt to exploit users through deceptive links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8b95adec---12359767603.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/kosatodogofudoku.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dl79u3hqg3l0bffpp9klbljhl2/bojilalixogefimuw.pdf
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/39351383024.pdf
    • http://gtshotel.it/images/file/49049285208.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0fccf54b2dea8c9414a274cd5fda61b6/91297429347.pdf
    • http://assytekservizi.com/userfiles/files/jojotefibu.pdf
    • http://nowator-zpu.pl/userfiles/file/79361833654.pdf
    • http://cloverdiamond.com/file/16565444160.pdf
    • http://xn--e42bt3l.net/upfile/files/vegijatifudadujegukegi.pdf
    • http://metapolar.hu/tmp/zugabenukikigeretasuxazax.pdf
    • https://airbays.com/userfiles/file/72630248572.pdf
    • https://mimpiindah2.com/contents//files/31872167862.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1ea494c2---52330982455.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7b33ecb1---sadatipanutumovon.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca801b1f59---83883822728.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44b42bac46fbc2eab24de5a8528c181f/sewiguxaxovewusaru.pdf
    • https://gamaconsultores.cl/upload/file/nexedarefipeta.pdf
    • http://bjbtrh.com/files/pic/file/3145244319.pdf
    • http://gayaarchi.com/userfiles/file/20210629220742.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/tolikigozim.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/gifozoketanositebuviwajif.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/rj0q7fu93epaetp5kok908ftbu/fegofokigofaposowulevi.pdf
    • http://innova-perila.ru/upload/files/31622261294.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e275610ac---gagog.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/oj400p6lkm2o22s0hrc1mfjti8/xegid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+remove+security+tag+from+shirt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010280.bin
4753ab4f5af81f848d9af829a6b1f4b1f88cc6716086e58cd53cc2fe96ff3b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10988 bytes
font_01_sfnt_off00011c25.bin
72c74dd414e4ee1ef86c4a9be336ac527e8f64911b2154e9ef493ea25e845161
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 17764 bytes
font_02_sfnt_off00014b25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B25 16792 bytes