Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21c686a055e147a…

MALICIOUS

PDF

106.9 KB Created: 2021-07-04 01:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 558bb4919cd94d71905adcfc985ba470 SHA-1: d0ec61b43687c2683fbba5d878d5b4f76b99e2bf SHA-256: f21c686a055e147a6e5f103325cf767a318165cd7f1d86abd412769a61f2aea3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://msinziniering.com/userfiles/file/bolutejitupebufopo.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de7a7aad070---12217905423.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/08f7959980a64ef72a0be0ec49fe9c70/4623470250.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/38cbeb1c86760dc6a34d3b2ae62478e9/72899096390.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jikevebonatovadewevetojem.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/meqhlnvhp5o19eb07vadh32c13/47382226694.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/wogotevezifovap.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/zumezerobulex.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/aam5fc2p7jqdlo49tkkm6do2o9/narululiligozur.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160999ba06ae0b---20716251262.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/54876510262.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae1229977---46807583409.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc04f3e70---fuwevikajij.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/po329bodbic7vs6r5bm68vfg93/8483046587.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a9c705415432b37363e1c3ae3a30abcb/15795516679.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895cfd1a1a2---45767617868.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fr35i53l93lv3vcsusork9884k/fobewepadexibukanavokafur.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16251510741795.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6f888a0d66bd60a5eb01572812c7c895/15977567909.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce044a342---11872123861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+results+shown+in+the+picture+were+obtained+using+a+technique+known+as+gel+electrophoresisPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 11320 bytes
SHA-256: a294ccf53c0e6c102ffda6684e415dacc7b94b3510583c3fba68af3e911370e8
font_01_sfnt_off0001506d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506D 19636 bytes
SHA-256: 9ac89b82e82571995640787971c9ab3ca88964c72618548951c341c52a1d42c6
font_02_sfnt_off00018594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.