Malicious PDF — malware analysis report

Static analysis result for SHA-256 94beb30e4af39704…

MALICIOUS

PDF

95.4 KB Created: 2021-09-07 07:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea561b869971dd9532e640c382261806 SHA-1: b01802d76ffa1d455daf4b5bdc75955a988e41cb SHA-256: 94beb30e4af39704396bc670b93e2ab0a44ebf29b76e8e0900a32c26a27fe8bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of these links and the overall detection profile indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://inwebjor.ru/uplcv?utm_term=commonlit+herd+behavior+answer+key+pdf PDF link annotation
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ebcfbad19b83e458da767dbf65383d00/60336087501.pdfIn PDF document text
    • https://scalper.ir/data/files/file/konubas.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/63bea87b36f87990808ee11935271b5b/xolazevitupedoputujuj.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/59794885376.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/lodugifelomomupoxuki.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/22405357594.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/zuxovevetoserigesemonere.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/vajujozasojije.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/64c567f2cb84eed264a9acb0901f435b/seliget.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/46985349532.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/32769675549.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607484556c418---motonobixiperakavo.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/kelimurulupofe.pdfIn PDF document text
    • http://aroma--style.net/files/files/parovazukogamudi.pdfIn PDF document text
    • http://ge-mak.com/files/mubokenegiwesoxumapun.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/939779640.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/faef7b4af8f73438ecaaefe61236c1ea/26332368661.pdfIn PDF document text
    • https://digireg.it/upload/kamukedore.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210719_FC85FCDD8822A13B.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sanir.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112176bc6eb7.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e92f100335c---betalu.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/nixusifug.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_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 11292 bytes
SHA-256: 620c294b04f1ebc0bcb28e21cd532857ee438e7cf12bdd6ab70a78681a8fb934
font_01_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 20064 bytes
SHA-256: 8091ecdd319619bbc82cbbc9be8576bb360eafc72ec6c444ab67aa950b5747c3
font_02_sfnt_off000157d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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