Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a994f74ffad3757…

MALICIOUS

PDF

64.0 KB Created: 2021-09-12 14:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f09e2484a9ea297d0fcbe6cdec6677ec SHA-1: 4c35481d7f877a18672a36c6657e6164f263e68a SHA-256: 8a994f74ffad375772609a4e939b224f2ec32d013d0f6fc310130a029a8650d6
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable domains. The presence of 'cmd' tokens in the document text suggests an attempt to execute commands, further reinforcing its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://npkfertilizerproduction.com/d/files/nomarubekokurakuxumogi.pdf In PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/83feea9a996a0f9436289395fb63c6c2/momadawuguwiso.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/sizoxiradupujawax.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/polavipog.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/vojepotozifoket.pdfIn PDF document text
    • https://sealskinz.ru/files/file/tasozaso.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/lekitulewenufexeralebeja.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902110709554942.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/ketisir.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613B5E5D1B1BD.pdfIn PDF document text
    • http://trivio.it/userfiles/files/lokupekopudoluses.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gefafafeledijejavitujef.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0131c7002---minusedubegejitezarem.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/munoperomaleb.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/29ichiqpg3osgc7tqmmcmdi04i/nujofekirivilewutizanuwi.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/91900096380.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/fudapugusurinojijoxefer.pdfIn macro / runtime command snippet
    • http://stfurnimart.com/file_media/file_image/file/12837517678.pdfIn PDF document text
    • http://armanetti.com/images/81495128137.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134995f105c3---80618495048.pdfIn PDF document text
    • http://timebymtm.com/upload/files/ginenimajopezaluj.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/rosenukimidexegodijexuzuz.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/07i67q36p2qn8afk8pakul21i0/kirutuzinokur.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/51726672710.pdfIn PDF document text
    • https://www.la-melodie-In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=labyrinth+ragnarok+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 10488 bytes
SHA-256: 496e6bb7d81272df6804b1b30e1376df88641247ef013d2ecf1c96b00be38667