Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3f5bf1277b3394…

MALICIOUS

PDF

92.3 KB Created: 2021-09-08 03:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33297e0fd1afc22d4121fc37989a53e5 SHA-1: 9a50f945aa7fd24ed746ec2208e6cd786c896871 SHA-256: 6b3f5bf1277b3394f00d415d67d1d03b192cb2512321784c66b12149beef5da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate the PDF is designed to redirect users to malicious content.

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 https://nomylo.ru/uplcv?utm_term=libro+de+jorge+basadre+pdf PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n5b3596htjn329jhim78h0mv86/43095918294.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e3ba2350---lemuvaboxerojita.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f35265d4159---fawazudonemare.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/570906d954d1e82eec17477a730ee21d/89019364333.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe81cccbb---vuluremaloborivi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/55d47b4e02522f3ecfd3ef8d53449060/sajowid.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/addcc3555217599e6343582c7b3dbeed/94067959146.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k22j4t1thrlso0f8r5ou1vjrk5/dimekipavawizugeb.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/67206453625.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/52254946365.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/58017102553.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d36be3760b613e6a91e90c99d51784d9/gogixijikivumerukanesiz.pdfIn PDF document text
    • http://orlickachata.cz/files/files/26760629846.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7715ee5676236df7e9efa10ac0a0c222/dasanutawad.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0958287dcc---19053552694.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/47580056542.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/56843343017.pdfIn PDF document text
    • http://wenxuezj.com/images/File/80481908946.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/sebajozi.pdfIn PDF document text
    • http://parc-hotel.info/file/68478546853.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210819070514.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370d5c33150---bumopoza.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

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_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 19472 bytes
SHA-256: ba46f3a67dfa2e7522cf9323e6bdff6892697b1001fb0286e6b2a916a0924ffd
font_02_sfnt_off00014b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B74 10652 bytes
SHA-256: 50701d489841c9b20ced01d4d6ed0eb18736044c30fa4ef88713bf2a7b4fc9a2

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