Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91eb79d0bd7f915…

MALICIOUS

PDF

73.2 KB Created: 2021-08-10 09:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71ed1b1bef4d6dcbe9560ed010eb9fa3 SHA-1: 781fe840873e2107a439ef8e3845136c274d61d3 SHA-256: a91eb79d0bd7f9157c5774cc61ba95e0244abe78463c80a186b02ba05f820c4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites hosting further malicious PDFs. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest a phishing or social engineering attack, likely aiming to deliver a secondary payload or trick the user into revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072503c6b6b1---sirejodufalugabovuza.pdf In PDF document text
    • http://huiking.cn/uploads/file/080631409093.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af940439444---23168578664.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/61392184058.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161114f2820ad4---75602119402.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210613_CBA5558185418075.pdfIn PDF document text
    • http://mutitar.com/user_img/files/8454171009.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/jemilanavusige.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/japaw.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/wugepupevelarokomowadas.pdfIn PDF document text
    • http://balone.net/_upload/file///vezuda.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tegawadebod.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/zatifakufisazajimatorogep.pdfIn PDF document text
    • https://phr4u.com/files/paletesozebimiruxemodidas.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/lazewamugutofigigolujuju.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd98c394b---59773070468.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a24d9eb7d82---21793747898.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jazejaku.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vigivegopisisisetusekili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=domestic+animals+coloring+book+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_off0000bd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 15548 bytes
SHA-256: d3f79378fee39db437c27b566e8e4560b57064b5af7652e3408a281060aafaad
font_02_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 11196 bytes
SHA-256: b7e3d693082836441cad893da3247c31beb1b868799d3c26000be749b663672d

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