Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef9d8081761cd40…

MALICIOUS

PDF

76.2 KB Created: 2021-04-28 13:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0911cbed4251b98d9d58628e2f401c83 SHA-1: 7f82eac6758303e1b6e95dbeb927892693e8501b SHA-256: bef9d8081761cd40737a89f2af89a0e2e61e4eade8699a294ff4a6a45d79a14a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'written labor warning format'. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/648aeb4d8056edc4e6d1295780c11cd8/83427730412.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/65a1f076727b7dba56420f20b05420c5/pupojosipasunonok.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071d3972215f---33174697370.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d110dc6b---kavexopumibagarenon.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/km9ivl13odihgl340ngdatgmc3/bididamexij.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lj10a2l2ichsdpcoiv982sehdq/mubogiz.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39e9d75ce---gatati.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca450a1ff9---xozopifabeja.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/5d1b309dae88e4e612b191b02991690f/40714335186.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4a2fb088bba89caed5f3beeac204e931/tolewa.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/71021de2e9dfade82c2a4ed4386fb33e/54941812057.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7830d232---57204237546.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087eba77fc1d---kotifojuzixibefikozuvolem.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7111baa0---gepugizibidifedinudij.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829ebfa72da---1253665665.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=formato+de+amonestacion+laboral+por+escrito
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f484.bin
a9a97143c5716200f99ee5b520c38ff2f0dbf5a10c1c40353e96abc8132cf942		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 5312 bytes
font_01_sfnt_off00010675.bin
0b39419ac8ed5ea296c5fc201be1d74ab98d0498c4a9d48a1f663ef42af0cd45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 11352 bytes

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