Malicious PDF — malware analysis report

Static analysis result for SHA-256 880a77c7cc7d3f14…

MALICIOUS

PDF

81.4 KB Created: 2021-07-05 04:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bae4c5fdc6d862682bb80dd876f18447 SHA-1: 780eb92a7ff3a7a4eb599ffa2cf42c1de8734a06 SHA-256: 880a77c7cc7d3f1493e49532f1594b970e6c26d7fbc63988e370343fb301cccc
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish for credentials. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/650ce7f28aeeb3389d770db4a8361a99/mubasof.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2a0809d6a41187f575aed52fa1104c2d/lilumuxilolibutuvil.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rliv83bnhoff78ohf007uabmr8/popesuwenigubotedinabof.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/gewobilimuposixonulej.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/eb6b3cd488d63c2e59585dd62ae2227c/87492077148.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3hlvbs8064hfmcbrknanrd1c60/5726264736.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/rawamegawuba.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/10823561932.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/tutujududetetififuwojal.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/560884c798471c7038e198b5891545e2/lutugazudotujo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kp25kijhrcua0089m4foc18l5e/zuwarunaduzepeko.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ha18nouovgau91e7d3ghoc103t/92313727706.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/76sohjtl8h44t9o31nu8vo9gqe/98324111099.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/duvuvumidibogaweturug.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/h69uj4ttgqacibbsnpqu2v12f5/22751519414.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924926ee0c1---tegedasomuj.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7c3a97d6---68312018331.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/sumox.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/bc45a7dd5d73fce815dc97384abdf7b8/guxisajele.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4d68404cb3ddeb3f59aa07fdb6e8707b/59731457259.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6ecf8fb13---52201277238.pdfIn PDF document text
    • http://tano-cable.com/d/files/puzezewixirarolapowogo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070525a70e57---xuzatewuzib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=high+school+musical+3+senior+year+just+wanna+be+with+you+lyricsPDF 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 17132 bytes
SHA-256: bce877cef45afbd012d1c8905f76158917b5add2528b69ee92ea17c973c7cef3
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 11412 bytes
SHA-256: 258522c0b74cbdd62c6416abbce661ab51923c9ad432815ccc6732aee50424f4