Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e1081a1c7eb2ef…

MALICIOUS

PDF

75.0 KB Created: 2021-08-10 23:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 447602eb8cd5c6c520776db0fe851076 SHA-1: 7a0f60a985f8e498de1bbf12066ac8a03a64efd1 SHA-256: 11e1081a1c7eb2eff3798e0fdb572aa6fb1302f02035d47774aa08a29e3abad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites, likely to redirect users to malicious content or further infection vectors. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://laborke.ru/uplcv?utm_term=interior+and+exterior+angles+of+triangles+worksheet+with+answers+pdf PDF link annotation
    • http://driver-jazda.pl/upload/file/55581674716.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/gejolidilivenikimuw.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160839dff83cff---28332399631.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ae990c37---92478667662.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/fozuj.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/99858738536.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec61f2e096---89747706418.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/rolilalabotokugorijokojes.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/81051913496.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/nixewamivezeduzafafez.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/veruriravuxerefirinug.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210616002610.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7384076f495bebd6a69cd09ee4079c6a/junutorisijibaxige.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/gazeka.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/87849034161.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/dapitewogaz.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ed5721f4a21a378462976d1030f2eab7/5193320220.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7830526e4df047abe782600218c91acf/welololuwogarafeleka.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/55496839626.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93307d9296---kuribenalowakiseleri.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c051bd23309---82642787312.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e313285eeb---gowexomivigaxubonuk.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9a81a1bd---kutixepurizedigisava.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_off0000c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C3 15956 bytes
SHA-256: 83a335d587a6c32a7aec03066812c564993c8a5b3c3f217d4567c8a6466d480e
font_01_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 11008 bytes
SHA-256: b0e4445999c8408e3b093b4d41bd6c6e2ae1a91c0aad277d4b8e0b8e6e24965d

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