Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c85b1c6eeb34b43…

MALICIOUS

PDF

87.5 KB Created: 2021-08-06 10:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: de895a759e8060fa41fdb5966dca0ce0 SHA-1: 37c26baf08b4e0ab8e246be9c390a830cbf5414c SHA-256: 1c85b1c6eeb34b437cb80520eb1f53fcd1881404429e461957261ff1de2a0c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://01host.ru/userfiles/files/96966974618.pdf In PDF document text
    • http://ahchala.com/img/file/68490059061.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/925786522.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/86229640929.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4s03g7g36qp0560suogms5eg13/73605811666.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/kosuxagexutegixiwo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a631b03a83c---4921490601.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/69f2eusdtacu46f86acq1qv90o/mifagome.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a598586d0ca---wigajepurebobite.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/33398754030.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0q6mq12jhr0ju6ghlfbsd0ge05/xebumonatefelitafadulejo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5324f01d4cc56dc3ffa5c8db0d7377e9/bofawetutajozapegedolonob.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cvn1h45cpbm98v58gs4t45m4e0/gaponerunidegusaxizife.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/39717750173a725855a31ba57b821a33/norusovetazaxetuzabodik.pdfIn PDF document text
    • http://stylekd.ru/files/gebugatapo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd521700e3---naluneg.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160962ad99d8b4---buwopuxir.pdfIn PDF document text
    • https://dhesient.com/media/kakilexiwulefuda.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ed30325---gupupoko.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qk2ajqh3s96da358s4i2coir5p/faganibiriwilor.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0934rnh016v0v6gbo2an82shcf/tasozipenaz.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606d203fe73c1---puzeg.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160867b856c154---22389232655.pdfIn PDF document text
    • https://anjingliar.com/contents//files/73278838802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nombre+del+triangulo+por+sus+ladosPDF 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_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 17652 bytes
SHA-256: 59b7df3800c3a0d200cd501597d7cdda80796a23b288e52d3525c1183f7df8ee
font_02_sfnt_off000134a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 10952 bytes
SHA-256: 2c7da78947b9dbce8b1414d37a9f4b7b9116af4e62a4858f4ce52a0448216af8