Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8f2b3922af4608…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 20:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf7021a33c0344a9a79cc8a4480842c7 SHA-1: 09290e905bc6b1a15ec80ff7f8ee2f77a8dba06d SHA-256: 6f8f2b3922af46089f86acee65b0cf483813b76048289435197b360ab478e3a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=android+lollipop+download+rom PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d47t2ehe5s3bso25mkcv85a6r3/duzexovepiwo.pdfIn PDF document text
    • https://digiconelectronics.com/media/19084361360.pdfIn PDF document text
    • https://kiptep.ru/file/vanamajizujorowotozesov.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210910135658.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f8d1b0d0---22514302761.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/norixire.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20935234582.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/68907033198.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/39367024523.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/fagudijine.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/11bde2ae59a521bdc0d70ef2adaf2394/gukoxij.pdfIn PDF document text
    • http://boki.hu/editor_up/28205295350.pdfIn PDF document text
    • http://mqskin.com/luutru/files/xajakawaremanik.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/jelosepekoduno.pdfIn PDF document text
    • http://taigesw.com/upload/files/zadumupeze.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/93075046958.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/toxikujaku.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/lubulofumeg.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109051829378430.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161306043527e9---xamunew.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ditutiva.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/12743022567.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/wejozopubojoponazakom.pdfIn PDF document text
    • 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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 18044 bytes
SHA-256: a8cd4d4bf79bad8f5db6daf4bf9d1b55b882659d9a9f6219621f8df0417ac57c
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 10220 bytes
SHA-256: f7f9a9e2013ff921871b8595c10079a2d1c54b81483351c410c47ead5f901c16

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