Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d62906407625475…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 19:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad9a12be4eaf1ef954100501cac0fa4e SHA-1: 30b729259a3aa54ce0a99744b131540689f93c2c SHA-256: 7d62906407625475aeaba1ae4ff38fbe0e32a29c3526dde8a0ab817e464f0856
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery. No scripts were extracted, but the overall structure and URL targets strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0e44a6f9---68956665393.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/630419cd2b8bd1e5fe1f4da0d072b4d1/63070505322.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/wetenif.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vafiposupenixepidi.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/vodubasof.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/bezowozazosu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/gusujaketopopu.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/keneranepudabezapo.pdfIn PDF document text
    • http://hidropro.hu/upload/88256903097.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/tuvadobebizagumejigojow.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/bafejazijolili.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/16666414033.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/xijudibovumakujazogopidos.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/jugijad.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/83573689441.pdfIn PDF document text
    • https://thehouseproduction.net/file/jabusugubakuga.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/28626429081.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/84e0798c218bb89c91293cbf9615da4f/11895542987.pdfIn PDF document text
    • http://ave-france.com/pics/files/nexiwitime.pdfIn PDF document text
    • http://kechengchem.com/upload/files/64571519705.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/55002158978.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/givunodigusawokedopub.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/pedixabegananuzawuwuz.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/xosenasudi.pdfIn PDF document text
    • https://foulardfotografando.it/file/31331728899.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/mijijezugefukadedarejix.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/61631154157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=star+android+appPDF link annotation
    • 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_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 10112 bytes
SHA-256: d9709f9574b392b7e4bcbddb5d35b66449e997db83165e725f0a76be13e8706d
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 17180 bytes
SHA-256: e714b8cc5fdcfb9cbd353a6c09f71bf05c2614a73d0596c8f5debef8f775ba92
font_02_sfnt_off000134f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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