Malicious PDF — malware analysis report

Static analysis result for SHA-256 642abd64d7bd854b…

MALICIOUS

PDF

98.9 KB Created: 2021-09-16 15:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffc90de60283ef5d6a716fb452e91521 SHA-1: 16b977d47f690b8d7d66b7187dd2b9762697d7d8 SHA-256: 642abd64d7bd854b6e3799b7b9105478690e90d181bb8a868b8f30aa50552742
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://cowmoo.org/ckfinder/userfiles/files/93018823276.pdf In PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/18727088285.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219323583.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/92595461539.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/jejopinudavusaferowes.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/viwawupeni.pdfIn PDF document text
    • http://unsersohn.ch/images/file/nomilupisaje.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/nivogubexulotusevab.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/84590260213.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///77783044469.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/17908156883.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/zolikefesoxetimanimuneg.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa12683637---xumazabepejinidowug.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/gubunapimofisuxunomodu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/94a26c2ac4cb887466dec8062af87b74/95654677689.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e59924f6---wunazodaf.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/19827611760.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/85059382814.pdfIn PDF document text
    • https://pratham.one/file/90582041157.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/14122221848.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/90809969209.pdfIn PDF document text
    • http://synphabase.ch/upload/file/1233449840.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/27887417553.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/zezuvuzanobe.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348629ee0bd---80397063360.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/fatajetutugav.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb1d559f8---gujovunakodafogol.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/89881381506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+message+updatePDF 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_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 10772 bytes
SHA-256: 552f796163861ecfb0be3bddf0e6dd9163057ebd0d92c17c1b92a7437bc1f30a
font_01_sfnt_off000136b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B7 17880 bytes
SHA-256: 7b55ca72d81e0c25006b5da136190052d0b1995dcf35e724b68f2793aa3bf488
font_02_sfnt_off00016576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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