Malicious PDF — malware analysis report

Static analysis result for SHA-256 95575db48eeda15a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-27 06:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 084802236a2bad7f1ac79aeb47a73a6a SHA-1: 3c83fde14a538bfd3a389f418a9d31c5e162b0e9 SHA-256: 95575db48eeda15a64f5c5e907e930a3d4d11db76c6a51213758882c16992dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate the PDF is a link farm pointing to compromised WordPress sites and disposable hosting, likely serving as a lure to phishing or malware distribution sites. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=the+alienist+season+2+putlocker, are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=the+alienist+season+2+putlocker
    • http://archiw.gbpopatowiec.pl/img/upload/files/karudenobipawezes.pdf
    • https://support-trevianum.nl/userfiles/files/mononenuxuj.pdf
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/kasaragowoxad.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353b33b908e---66398841975.pdf
    • http://nakloboucku.cz/uploaded/file/goturexiremevemijibibixu.pdf
    • http://ymmicro.com/files/files/63376834572.pdf
    • http://northmarking.com/userfiles/files/23317654061.pdf
    • http://nrgmedia.hu/files/file/javulagajog.pdf
    • https://camgloberealtor.com/userfiles/file/latamujeladovega.pdf
    • https://mimpishio2.com/contents/files/wizizaravuzefatemediki.pdf
    • https://ibextrail.com/editor-images/nuwejogewife.pdf
    • https://jss-moms.si/upload/File/66436457159.pdf
    • https://bodymart.in/ckfinder/userfiles/files/93949819771.pdf
    • https://armenia4d.com/contents/files/diwusamazabugikujofo.pdf
    • https://minlinart.com/archive/upload/files/47870302492.pdf
    • http://londonjip.com/userData/board/file/laxileputepomo.pdf
    • http://boekenwinkelindex.nl/images/uploads/faredozibof.pdf
    • http://amsaneeraus.fi/userfiles/files/fufigelaridonuxikug.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0ae43f6c68ed060cb3f6b030208ebf74/99625144259.pdf
    • https://htchninc.com/d/files/90579775803.pdf
    • https://j26clean.com/upload/files/turupapokitutaz.pdf
    • https://legouic-peinture.fr/userfiles/file/66524240495.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e00ab52296---vujolumuxaribak.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2o4m9m367mohtoipk52cqobk96/88168426036.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c153.bin
082765949d5fe392fda2e96633653afb55248bdc4fd90309202814e423ce892e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 10748 bytes
font_01_sfnt_off0000da10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 16792 bytes
font_02_sfnt_off0000f222.bin
23600e47cec54b573f23ed1c16f93945f769c159c2723e391c70c1ce7cfc2ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 19732 bytes