Malicious PDF — malware analysis report

Static analysis result for SHA-256 5975f1716b9b6abb…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 08:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad141b3016ec246832d8123fb48fa292 SHA-1: a66ad24964d56df731fe82f283ab9c5a8d8889f5 SHA-256: 5975f1716b9b6abba69f185da918131f642e3bcee1d041a0c0013235aae3c2cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting, likely to deliver further malicious content or exploit vulnerabilities. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/i7hej7dp2oqqmotmf99rk6blnd/jonirokamiketexigezuzol.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/338066865.pdf
    • http://ztkammer.at/uploads/file/gamugasuje.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/zusajeri.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/d775a1kfi2m4sjadcfjlrqnuhr/68306530510.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/e12451996308e8d3eef0a462d6969524/xorupifa.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c268b554---xazadok.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1332818230609824f95fba7.pdf
    • http://jump360.co/upload/files/20210716034229.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ff367f3f---benak.pdf
    • https://hogies.com/includes/template/uploads/file/dijesenunutune.pdf
    • http://dok-vo.ru/userfiles/file/28930121311.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e05d09c841f---wororirabupekerede.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a233bb0ea68ed838492bce5fd31397bd/xepiwomonezagiro.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c18cd6e6db13607610a77eeccc089cb7/kekug.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d66dc63ef---gevigoxajitove.pdf
    • http://ahlhy.com/uploads/file/181916492541.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/demobolukuva.pdf
    • http://hysansam.com/fckeditor/userfiles/image/tumudomugipesuvafeninapo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/69fc2fea856fb3b73d60f29146c5a356/nokivivebutaz.pdf
    • http://saga.diamonds/uploads/ckfinder/files/matuped.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/uufr3ntclr5fpjaktfnjcqhhaa/remixod.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/idijjv9504675gn4lkqs57g7nr/puribu.pdf
    • http://xahscw.com/userfiles/file/fozonebetufufotiwa.pdf
    • http://drxzhang.com/userfiles/file/panowugaxilekifapimutus.pdf
    • https://study4student.com/cache/fck_files/file/somubupetivitenu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sst+important+questions+class+10+2021
    • 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_off0000ebb2.bin
5895a5fd2e5f0b36167e32086e026e37cf05884ac1c29795e7bce94c98e11036
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 11152 bytes
font_01_sfnt_off000105bf.bin
ca3719f5d5da84664aa2afb0c01ca39a61fd1a2cb78164a87bd31257a0a749ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 18156 bytes
font_02_sfnt_off000134a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 16792 bytes