Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d5286893b68349…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 01:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01b16f517c4f013fdd6d0ac13a62be78 SHA-1: cbb1cd384e4d083500bc536763a87f3746558aef SHA-256: 55d5286893b683496d175991f30e2317924e8d42ed0027bd85517c2a237ceb9c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious payloads or engaging in phishing activities. The presence of these links suggests an attempt to exploit users through deceptive content, aligning with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/hoqeq3ejllo3bra9lkd7dugacd/bokutisowun.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610663948a2d7---zabave.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2674ef5d---dijuwosolozalomudixa.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/70ef8f74b8cf5e1f4fb26e090e798f68/7804319255.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/88013709535.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/35f310912b327398124dbb3db1ebe957/pixadome.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/dikilagi.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/82688782664.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/kitas.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e014558fe4d76fa4f38bfa8e9acfd471/wisofivugorinuv.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5a86751bc232fbe48c05724ec914c062/begojiribodig.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ea76i92vh6hnb9h70adqa2hh8p/74089109547.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/v82kbje8fvsmih91bj844o2nqv/40010599583.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/sapumikiga.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/bhah2352nlmnoe93vt9cgr373f/wokinat.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/p9i2ir2cufq655lnlk0ch794pu/27983517075.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5eabe744580c56d702d14ba2ed36818b/gosimerivujumemevevuga.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/nipuromobopi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5988922c9---kavovafojemedetovar.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/ravagudikagigajususuxafe.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/46461691606.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/wuruxuxawewirozinom.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/18mi7moh1pmampm5ndnjavilp5/bojazar.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/87014814327.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/ridolokogidunoredet.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/pr7da8qemnne5qs7sneu12ane3/42751743598.pdfIn PDF document text
    • http://portableandcool.com/files/files/jesejiwasalatiwapowut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=space+flight+simulator+full+version+happymod+apkPDF 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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 11512 bytes
SHA-256: 2499802a5ae42cda151ee36de088cdd9afbef1fe230e7df92fb48e10f877e2d5
font_02_sfnt_off00010f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8B 17100 bytes
SHA-256: c447871ab7ab717b2783046ec4bf3f4a948ea716df94f0e63f0ade9b33140efb

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