Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ee48381b6db5fa…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 23:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e104b70a35676e189530c12878fdb0ed SHA-1: a03591b9d2742df38d0070b3f47e3c2f2a4543c1 SHA-256: 28ee48381b6db5fa73409e04b12e628a464c9b71a3da38c5008b864096349ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF link farm pointing to compromised WordPress sites. The presence of numerous external URIs, many hosted on potentially compromised CMS platforms, suggests a distribution or phishing campaign. No scripts were extracted, but the overall structure and URL patterns are indicative of malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/47d1c0f9431240cc676935828ddb6c49/jumukewipimituxoka.pdf In PDF document text
    • http://apvn.info/userfiles/file/27997607160.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gobuwexogugofejiv.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607500c3d91a8---paxiwesavisisesegopopoko.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a08c5cc2a---83478732914.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/dijexawudujaradiro.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/55701683defb7b8ce1ba2360d85f83c9/8463282090.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/22304280551.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/904624f791ca698929c40359b1d1a26f/7354137767.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160767b24a575a---34781962388.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728fe38060f---69433031708.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7330bec7e28b3b3e062d609af874c781/xanalunasujorutuliri.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/kuvoponuloxuferatita.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/17b82a7f4b5b4e3c80efb9ecca015ef4/filabevurasalebedibajo.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/kamujepako.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609265d53658a---8525243214.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f658b55c---22154592817.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0bbabf1aeee1a7aaf5b94df2f34701e2/7232992714.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd697f5e6---9589410802.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8cca6713800b711779453c25cee39067/76273611862.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/48arb2up9slil19f5ilh8kvv34/22933758812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stacey+and+florian+2021PDF 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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 10784 bytes
SHA-256: 6e31c4c22b9ec3bcfa8ae728de767205a82709136305d15b7ea95f430ae16688
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 17484 bytes
SHA-256: d456a749d745af4ac83ea26cbf597cc66f369dac32c9f018fb00601f172834a9
font_02_sfnt_off000137d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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