Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de6a539b7078d16…

MALICIOUS

PDF

69.8 KB Created: 2021-05-15 17:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7a780543b8beb7d89be762a6e578ccc SHA-1: 9ac40ad25d2de291f9782414fd3ef1e43c58017a SHA-256: 5de6a539b7078d16df6999732fbade1258d277cb313bd4eb02ea641eb104c4a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this, as the document likely serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=engineering+company+profile+template+free
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a4f8c9799ac373d07a81be30a2975e56/77068262329.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/av1dee9p8sdgmiqi76oj7i53n6/dezuximixowolug.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/faabf1cd691ce31723cae603a12391bf/pudaxiwi.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b0f3186a---5454765448.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7db61ca04d9f8389b1dc4980925c2109/74315569159.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/25324742870.pdf
    • https://communeouchamps.fr/userfiles/file/69022462849.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7ef58adc38e2b9ed1f8045e106c0f977/49638199465.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4494596387e3edc3e32a4b232334cdbb/texojovolijif.pdf
    • http://allasclub.com/campannas/file/wavifil.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/f8b48de7eeb03cda18eda9e31486eb5a/bowutiwerewibexowisiz.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ebj4q674hpufgt2qj2utpp7hdd/tufefiribovorodumixen.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdaac24f03---suwunomesafimekimole.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092886443d07---59197965483.pdf
    • https://baoholaodong24.com/userfiles/file/zaxisezuxanu.pdf
    • http://sotel-perm.ru/site/file/55157362188.pdf
    • http://anatolianlgs.com/userfiles/file/94809066315.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098792013181---52774914069.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f1.bin
e91c35ed29453a48ebeabc439b73c191bec83aa61d2f86f0e587d50089bd23f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 5216 bytes
font_01_sfnt_off0000e7b4.bin
a35a7148e294bef8f4c7b5330c639eee344de0a705f12c51d1b4c37d5d368447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 10092 bytes

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