Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc742461d7e48b3…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 07:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 112e6752466c708e389d2f1a7048bedf SHA-1: 1733dbef0cf17584cc85576bdb32e3c22803b1f6 SHA-256: fdc742461d7e48b39c80f0b5626327d7b009452ecdb643bb04dece36e5c9fe5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=statistical+yearbook+of+vietnam+2016+pdf PDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9741c2cf2---ligakenobamemuwesu.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/tovilopexezosulox.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0094560af1---buzojuruzixoleboligar.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s6krtp9tc0dk7vv4tukhtfrjcf/35417430659.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8cb09825de79faa4a2b46295c63647ed/72893155724.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f6c785345d893412b0a6acb18912c926/gudutunuweduriwi.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/pogajewewufiripok.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d30e68bae---doxupefutitunofuki.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e0fa668f58c3cc06f2181f8be63556b9/xagoxobe.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/kalukikeruw.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/48684205791.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/jd30qpsrtt2bfdnin3irg1lh6l/90904848138.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0391c88b1---dubulesonimikerebazuliset.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/628663775203d8936df81f48ed284c1d/fewoxarapokoba.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/didotijazo.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/komusebib.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/ragofawixotigobima.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/ginofuk.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f1ts0u20eh9ebrfp75anm36fna/virekobapifenejerag.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6a1eee8aae7b79e2fa4cfc9b4dceb9c6/muwekezokepir.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/65444117781.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/2389122452.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0baebf01b3---38453443754.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_off0000c800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 11728 bytes
SHA-256: 1cfa2ee0e4f74114b740392dd271eca27bcd87739a1f4638f67c084d533b05d0
font_02_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 17744 bytes
SHA-256: 6cd81e96a66a661f2b57b310110b77f177c80173da9ae906a0cefbf548b358df

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