Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f02df82f8d0fefb…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 00:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e34c1905a4ffae9c28928f2a3b20b11 SHA-1: ce6f3db83f3097d3dba10b5e9a4242370fbff63c SHA-256: 8f02df82f8d0fefba6c23a0a7d1491099f20af08db06216835098f4ef3d23ca2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to obscure the ultimate destination. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security filters by encrypting malicious payloads. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=gear+icon+on+messenger PDF link annotation
    • https://paradigma.bg/uf/file/6720367290.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb4257f89e---zufemokilopamurom.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae9634028---14467146040.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/47064553148.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/20553585001.pdfIn PDF document text
    • http://cutskytools.com/d/files/timapuxovapabile.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/xemikepurerorowazu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1602434b9---kelomerobisitimonanazopa.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55557934853.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/6284849388.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-16/f711e366a5cddbf85e7e497472b067b9.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba7590eef---lenotanofiri.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/povuso.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/17603991541.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/fekokolateliraroba.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/78899742753.pdfIn PDF document text
    • http://symbolfoods.com/files/file///nafalulafo.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/20404733282.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/10015986855.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/32119304638.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/jazenigewumudilutisarefog.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/91289941176.pdfIn PDF document text
    • 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_off0000c8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A8 17712 bytes
SHA-256: 2455bd18091b9c8ffc95d31ab470f0bc688da035b47974e54ee7716ff14ec303
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10468 bytes
SHA-256: 1ab48ab369754a9e28a315a54506bcc96aa9b172c52c9910a7013b3c555c30b2
font_02_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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