Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb4d81e514149c6…

MALICIOUS

PDF

103.9 KB Created: 2021-07-17 17:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b6d15b04809078aca7566094dd5a578 SHA-1: cf7861153c9538173c5d913bf93a606105310dc5 SHA-256: bdb4d81e514149c6c44c6c5cadc7e17c0e0a556b9897886b96bbef49635ad900
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs, many hosted on compromised CMS uploads, suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae34916ea3---63205055119.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b77b0f5145ee0e7a4c94c665ae4c8cd/wopimame.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/96354131042.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jenopitumopaxanaxoz.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6d47b293---wizukaporukupu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/38d7e3716d3e4956bc1865880aad100c/45424749174.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/85026790841.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/fexak.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e991604b8---41103382947.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfe502588f---52005420775.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be7d19c21---wewajiwakek.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/49ed6bb9b1e066c35072107742807bc1/10674123250.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2fc79ca60e0114a2f93ba086f899332c/1285176793.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ktqjahl10fcdk0b7lmjheevut3/vemusakop.pdfIn PDF document text
    • http://azizolace.cz/images/file/89185965440.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d289666abd---sedovotov.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8b4ac95a---73996520814.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n32nf3gjjfglt0invg1dp4nef6/87557071871.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/3327775783.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7fff4269a---butuvakarobomiwokuki.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/24537847206.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jrsde142p4400et5kfs2bd6up2/xuradigep.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/morexejikinip.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/rllne4srk2ebkj9agkc965h17i/16221885801.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/aah405frqcontpi66qegnjh1ic/vifivapikujepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+type+of+pokemon+does+a+shiny+stone+evolvePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 17868 bytes
SHA-256: 1b1ce77ecc3afaf3a4d00f7998e7e850a58abb646cee37a88759a1ae1a4bbccc
font_01_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 10928 bytes
SHA-256: ae9500e68a7fcc0248834e449a6b03997a55cd46ab52d47859acd14b6fdca16b
font_02_sfnt_off000150d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D9 12928 bytes
SHA-256: ad84df5f89208e66deed63fbb350137e4cebc1479e5d32ffe992c1f0cd095df0
font_03_sfnt_off0001793a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1793A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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