Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5874334ed8d62fd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 02:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 302117e9a6ee1ae72eb0d4459ea04a8c SHA-1: eec207eb600c1663daa7f11700cba8f13e9855f0 SHA-256: a5874334ed8d62fd047dafaede83762717e2afdfb45e78333aff20c0b1c79d56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as a phishing trojan by ClamAV and ML classifiers. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082861e53a57---tobironibabemagibowepebej.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/meu2lfthrtssrhjme1p3dmm9m9/gujevunobuvig.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e5e9b813ab0c453341b88b936e0c103f/49492882593.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/zuzikowusumoj.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0lrdvqlufk8u3259s1jr0pvrgf/jubanewavevevurozekuxo.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/datidul.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/57561164243.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070996bf1ea6---borojitifaku.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/gorenadiguweselozipatowo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3103c4459a7decc3f8551c86935c5e48/78317017566.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210522205417.pdfIn PDF document text
    • http://metallpress.ru/files/xamonexosixubuk.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021081603284545.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/j0d77ls25k91bm3f8idi0pfpt3/nolawox.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092668bc39d3---bulijulelobigikafudewobu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ef9eab0a---4002120056.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/towopep.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/401eb5fcc54c0db8fdcf7529877fe5b9/87326583040.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/fugolu.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/boduzugulitafisinivawetat.pdfIn PDF document text
    • https://coil.hk/upload/files/wiwoj.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d6170c5d---89399726804.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce739dbc5c---99014861594.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7e8249de8a6b3f713383601426627111/lidofofuzenofovamixize.pdfIn PDF document text
    • http://rld-carbon.com/file/janinegene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hitachi+450+excavator+parts+manualPDF 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_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 11232 bytes
SHA-256: a83e3a1049d91bf5b54b464db351c26731341ffe3380a506cb813bd493b9f98e
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 18028 bytes
SHA-256: 585dda1c6bc73ca131fe2d0e59f5d121ee983c1dea66ae1a7d0c06f25cce58c9
font_02_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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