Malicious PDF — malware analysis report

Static analysis result for SHA-256 24273d6e9e7aade6…

MALICIOUS

PDF

84.5 KB Created: 2021-07-06 10:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6ca1b6df59cdf11e15cce9233ded4213 SHA-1: 1efbcacf4e42cdab8a47f960985d72ae96c470db SHA-256: 24273d6e9e7aade6480705e277da7f051254f442e9e33410964f914610061de7
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to compromised WordPress upload storage. These findings suggest the PDF's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/79582552505.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jftg8i17ufn9vll44cekamsun3/saxikokubodegalobaroguri.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/zorekiwixipufe.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a655825ceb7---zuwivafivilaxumoxirem.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/51719224398.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/70144555358.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d394b6f6a296463ef540507502f936a/64507201286.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/23579788090.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/futuwudeselusoguwutu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/85c8897c6efefff892a1d3f6a721b1e8/73853644913.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/59340bc4b67ad0e44a5d1c4144b5d4b8/73073650772.pdfIn PDF document text
    • https://papiratisk.cz/soubory/wilajuborovosumibi.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/vixanosovon.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/63217794764.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fitedogitorolorega.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/257dc019a71c8dee386f916072d560e5/sekujajetiwegafazezuriko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3539d0b56---pisefufurerajinasinadapu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5bf9db8ec---dimabugunudazademepedox.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a46a6c13912340ca1dbed3638c5fe8ef/42926482400.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/irqj10ck0rkjrkj1j45p8s87dv/17545592957.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4c7c3db6---21128561338.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/97947729840.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b7c42ec7---15807837428.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/44dd8db4d7411f862485747ab04bf78e/gijoraje.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/tavejibadid.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xolopozibiboki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sharp+cramps+in+stomachPDF 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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 10536 bytes
SHA-256: e29638cdf0c53b9b2351e017072eb20e3b1cdaecba23b11fba5874bdd8aba63a
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 16296 bytes
SHA-256: 61947329cb4aa1c05f873cf6b0fdc3a72993032cd4a3a8cad5c1f54e8d553544