Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca72cc24e0a6414c…

MALICIOUS

PDF

91.6 KB Created: 2021-06-27 06:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7010779ff2736c2bb4fdbb8c83b3a10d SHA-1: fd89543253fe377d060622b567eae3dacae879d4 SHA-256: ca72cc24e0a6414cfb8e191df7bec36bfe50c551fb89cdb5f792f860ee7f2792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, and others to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=writing+a+montage+in+a+script
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/quvju653l2snhnh07s8jmhsi46/dozavima.pdf
    • http://arcomproltd.com/userfiles/file/tuviwinabidelamufutobebun.pdf
    • https://dalilak1.com/userfiles/file/59923859909.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9e84c71604873f1ee21eb58e39eb52e6/lujejutisezudu.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2536bcbb7dd5f56071ec7c728e795e1a/miguzojosaj.pdf
    • http://inezorviskids.com/clients/37546/File/73818481206.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7um11cbs03qhk6v23pull0in7d/87488370189.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/fenebixulup.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceae5038a4---lexodeveforozadukududadow.pdf
    • http://cuspsurgeons.com/userfiles/file/fijobixalinowofibod.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5137898a---daduzojuno.pdf
    • http://belgium-ex.com/images/blog//file/3581730778.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87c07068a---vasideni.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ea05a123---naximafopanibameje.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb53ff2064---76104906150.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0286b49015a171436f8f19ab50c57ae2/rawufosi.pdf
    • https://soalmatematik.com/userfiles/file/divepirufedupazerosetutew.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e529c457a7---nekesobelanawejajojado.pdf
    • http://driver-jazda.pl/upload/file/22087720110.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/djn1b9fsqo9os4s857tunuvb16/gogasexifojimaram.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f5322f4c7c17f408e513652fbf72777d/81201110905.pdf
    • http://activesolutionelectric.com/images/file/tapezosomajuroxunezutuf.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/51c9c1c401114cfb7b3cb08992342350/zitofakosibizi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001037a.bin
abdbfdb2c17ab8f7786c4afd6b85c52bea66155039b5eb95e5c83b8fab374039
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 17380 bytes
font_01_sfnt_off000130a4.bin
d029163e832c096b915249ef50f27944ad8c9807bca3b076f60a92aa3d4f7ab2
pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 10664 bytes
font_02_sfnt_off00014919.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14919 16792 bytes