Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42ef07dc82a1c43…

MALICIOUS

PDF

90.4 KB Created: 2021-07-02 12:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43109ff2680daed0dbfd258955850ae0 SHA-1: b5a1541dd6e5977f227563bdc7ce6a2fd9ac6336 SHA-256: f42ef07dc82a1c43b02a19721e486691b20b9b64ba85b6b07aa2179b990dd240
156 Risk Score

Malware Insights

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

The sample is a PDF document identified by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hani-bee.com/userfiles/files/sanafuzodutefawesowus.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607952da45332---25564975243.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/zadunenalagekenoj.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/0403e9519132385626637e7a29ad6aa5/29502701775.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/50f0667c7a3860cf2a91abb1e54687f9/40698055779.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/05c3a928abe1fac94093045339613040/5076188172.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/wamiwunagoju.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/6a1b55d8a1cda4e327147d4a448a0e65/82318816473.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/pupafen.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/88737513371.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/68758009004.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74e514809---27970475980.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/46ff505e3d2cd070d4e3c40d54adb7f9/gewexuva.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1i6u069pfq4jng9tcisl5htbq/tasunefiwofe.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607876d8a4ca1---fisatagasopogowaxovuzabuw.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607153274cb95---pamodizipukonowonuwubo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0e8f6c75fe34b3c91648982af02b24f9/velonagixijudodix.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/63ugqimp365h8rbo8s603mniv4/dadegurefapuli.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210615045358.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da734b46a6b---32363882053.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/deb29aecbcf387251c9d8fd8da69764c/worobo.pdfIn PDF document text
    • https://activepymes.com/pub/file/xipowivigupirefugodisig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=singular+and+plural+subjectsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 11016 bytes
SHA-256: b5c03c5454da3daa28f392ba52d5257c73e4cd7696837fe28ff156616d562a85
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16928 bytes
SHA-256: ae9bd206dc3fbbdafbf9ef9214742f8e98dfc582646ae0c7f46aead7a841e845
font_02_sfnt_off00014499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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