Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d1aeb7abb3fe9d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 21:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3c250c94430da6fe28f14fd603d245c SHA-1: 57999ae7141bcbc8b4b6137218e5d76f958917ee SHA-256: f2d1aeb7abb3fe9dea190cf84eb0b51f0f71fc7d3b0a20d8218e0e5f8200d4f8
164 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of urgency language and the ML classifier's high confidence score suggest a malicious intent, likely phishing or malware delivery. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chcial.ru/uplcv?utm_term=night+socratic+seminar+questions+and+answers PDF link annotation
    • http://willbramephotography.com/divas.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/tidolimifemipenopesibeneg.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/pijoloxot.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/tukolenusa.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/fizoferafotosaxepiv.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/xotagidigolesaranozumutif.pdfIn PDF document text
    • http://simonide.org/userfiles/file/56615693377.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099be40094ed---92207137704.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/xefumunefigibakagotoso.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4b204130cea2fb4e37eb3836b8cd428c/pamoboritejef.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68b7d21b2---riligobarewevosukolidan.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d62401c04---24109345581.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/robutafolurinuwemet.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nuvolelatorazazilusati.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/fosudowud.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/misaxabidej.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/78493218374.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/wawevobozagoke.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba5210da3---76223334896.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca01b5b585948b0a7baa90f62efa102e/pufutod.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/22647855465.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ce7fdd59b---27364152684.pdfIn PDF document text
    • http://dentherapia.hu/files/file/16502089158.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1de4c146---zapepexites.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/88272496783.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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 17452 bytes
SHA-256: c8a4d51ed6b90dca95281e7c1c1abdca6b1ab639ff51f566c5ee6f8e55a713c8
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 11080 bytes
SHA-256: 86980000c7d078d0e6918f488baaa2f515e82891227e7055a84013fc6f28da42

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