Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0331f938af9848…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 10:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f12925598f071aed66c49240bb92739 SHA-1: 75e3d95af19e09569a98aeaf9a98cbc96621b227 SHA-256: 8a0331f938af9848cce6997ea1c0ab4ea7611940536fe4f50c722baf6c584f24
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The PDF structure and embedded URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160803e68a2cc5---goxirebu.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/6un9q0gjqr9emr0sts3hqql5i2/19334153505.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/bemolenorinifamex.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/11962265822.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/kimarodizavapen.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c09b17a9---89436412765.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8993de6fd7---80519743642.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mso67snpvvj60lb0cgrg22r2lk/95528506143.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7b5b524c---12742410125.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/butovoxaleretubi.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/likimomekavimuzubamemuji.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/99140717419.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/7k9t6l2295s8lt6tdpncr1oo9m/gexisiw.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/55080883070.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/vekafiriwelaxegiw.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3qk3r9a6h1cc5iapo4imvhb1l0/wovirosagajogusivorex.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121a42cdd18c---mumumupupilakal.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/dufawivipesisamasexo.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ac57e82b942b99d2393d6ca01c33219f/dadonulabibibubamegevoz.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/vokomeru.pdfIn PDF document text
    • https://techlan.pl/files/file/xumibokodilifizowako.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/zojezizonodapeteseziru.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93110535206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=jyotish+ratnakar+in+english+pdfPDF 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_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10972 bytes
SHA-256: 06369c025811eb4fb4b5031e95bf3c5d96a3badae6c0a883587c0f71aadc624e
font_02_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 17548 bytes
SHA-256: 6c47dcb7029865928e9913c0a75c691fc9e75fdb8889f86e339ae7c3e1e7d8f0

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