Malicious PDF — malware analysis report

Static analysis result for SHA-256 95af5822907dea3b…

MALICIOUS

PDF

87.5 KB Created: 2021-07-04 23:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a3d9bb4832169ff91ddb2aee3455b838 SHA-1: 8687c1333bd35eda562cb40d7746aed26a5f4302 SHA-256: 95af5822907dea3bf642f237a0464e28d81a3a5d73ec6b72b80a954d84349aeb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple URLs, several of which are hosted on compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://summit-christian-academy.com/scauserfiles/files/5978861599.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/79e3fcde76d70b113a823fd34add820e/3822123310.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb32ae5f7---wejoboxidowofupige.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c4e8d5c2c---bomawal.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/6244408956094b00c10959.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/nisanejapipakut.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mo6g8ef3sc7kr8f8bt06jv9p22/bagemuvabasurenagumised.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dndhos5383v7h4hirugi5npogp/wusavanemogomarusisuzox.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/27169479583.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1b03f3d77b804d62a975247d9eb29909/86725896159.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/824c8634a4cc6324b12ea5519d9fc4fe/rusijazutitupot.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e8a651d2---mofimiki.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/92413510881.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ab1874d6053b0af215c1b87ac98628e4/wupivavixovovusako.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/bifidemaxemitulu.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/8995659333.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460040678e---rifez.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/nabotapijomelusazu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/nawewolidivuni.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d3184966eda98f861d167c0bda88d7c8/vatiketomenejofer.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b503ec8aed---73462776852.pdfIn PDF document text
    • http://adveotec.com/img/file/gesisuzurik.pdfIn PDF document text
    • http://ea.fflch.usp.bIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=encyclopedia+of+anthropologyPDF 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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10828 bytes
SHA-256: 3a200facaf3863bae0f31841f5688708e216b6bf5b6c22225de85b44cf702a05
font_02_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 17312 bytes
SHA-256: 05a593839b377053513067537c16ecb76bec71ed7c5f023563f6d50b2c98bbf9

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