Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdb40780fd8ebb1…

MALICIOUS

PDF

93.4 KB Created: 2021-07-05 19:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1ba8a2ea98942c0fad853f41efe4376 SHA-1: 4200faceff295b6cab1439dc065c0005eb777875 SHA-256: abdb40780fd8ebb145d4ab3bd0f2cb8aa04b1d91c0684e248a285d8d96ac8d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=annotated+speech+example PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd086f724---90722965593.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2fh4kuf67f02sb4p1i67emck0j/wudidexur.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/780ed55d71721593ee71095c6e9cc3d7/12694207203.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb564fcfcdedb46c29e4ecf1cb8e6f72/92431716252.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/dekirifopusojaxiwiferenij.pdfIn PDF document text
    • http://altinay-law.com/images/file/21380698625.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/aff5fc2214cb267821b470d5a0e17d4d/widenigumazinikes.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/a5bmev3ldkvsb13ia8q7p69v3f/27355354038.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/63469062594.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/b8f57a6d263f12136075345431ccdf99/50675827413.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/67139961428.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/nowojixe.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jezololazazufatuwaliba.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1428e816---54315797672.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/fanawixof.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/aapp29mb9g4mor4s2gos8rflu7/47370433741.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd091c0627---85017237884.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7t2iort345k624590d7aspeorl/bepumotine.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9039d6a8---4396742995.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/77451393252.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/tufipemurelala.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/13254102405.pdfIn PDF document text
    • http://www.toptehnik.si/images/56977818649.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16071629883dfe---75052013917.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/60369862017.pdfIn PDF document text
    • 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_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 17448 bytes
SHA-256: f91d29c0c84562664673ca4102d572153c8384a58dd23d09359c20eb063b1449
font_01_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFC 10672 bytes
SHA-256: 8614baddd74e5f4905ee4e281a43b4df9b97c127a640b389804c372b25056201