Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a244e33be0c066…

MALICIOUS

PDF

127.3 KB Created: 2021-07-07 04:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbc9ef5679aad08fc268600244fcb1c1 SHA-1: 161bca33557a555adee367e039b8cf7f867dcc15 SHA-256: b6a244e33be0c0667baca510556cda3941e873d93e74f0e26bba9786b5164d29
156 Risk Score

Malware Insights

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

The sample 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, suggesting an attempt to redirect users to malicious content. The PDF structure and link farm indicate a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958c48afcbd---bifebapaselukusiker.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/325a6bf95d60a6eec343d4520cbc3709/xetotada.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3440ed2be---32409300000.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab904e6ff---xawenivaj.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kijokuj.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/44452247716.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9b36f8bd---72516653660.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/22072557950.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6e73b436c---16982240441.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829735891d9---82463385121.pdfIn PDF document text
    • https://petala.gr/userfiles/file/61924284295.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sn6korjbehms2ih61pkvadmjca/89710452647.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/340578082b484c2202658c56ccf18242/fadiwukiketepu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/petakobomabo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/46586269229.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/358b7227ab05e9b14b4a3a7425bb3d61/wegifuvaletesur.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1192f5ffb1---zebiremobegopigus.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/lizaziwojukosixiz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b59f4779c---19657964520.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27fc0428fd---sezulituri.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/75484720390.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083a617b02b4---25237716929.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608142ec7174c---59228976059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=scout+tracking+signsPDF 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_off0001771b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1771B 16200 bytes
SHA-256: 017d71bca995e67aebe99055a9224cbac5899b1f8321fa28ee7b2e6f6d039197
font_01_sfnt_off00018ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCF 18704 bytes
SHA-256: 400eafbb24e6d47cd4f7924ee8d4a5d0c3ec460123f572aa140e1ca06f152f91
font_02_sfnt_off0001be17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE17 10496 bytes
SHA-256: a273efa1371857a85cba1f65dc6fa1de3884ad2f3b078c06192457b3928275a0
font_03_sfnt_off0001d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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