Malicious PDF — malware analysis report

Static analysis result for SHA-256 5072380b7268c79d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 14:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13585de0cfb82e5d8c8d1be50ed71af0 SHA-1: ca1cd8fdf8de9dddb0d107522c61867c1f499e84 SHA-256: 5072380b7268c79de93c83468c2cc44aef956879b4a64c814cae347747bbb5e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or lead to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=stanislavski+actor+prepares+pdf PDF link annotation
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/d7ql32oq0cbjsin5agjd4bnk74/zeguwezetoneripe.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/pudikosegekulewuxudon.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941de56f85c---417160014.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/28520488912.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1704dceeb029aa4e49c857d340557771/37781317219.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/90961507263.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/193868117.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/31591935747.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/33970250248.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/vovokusuwevawufutugob.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/devojidagij.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/newepizisogoxa.pdfIn PDF document text
    • http://skene.es/userfiles/file/ludubomomawejuwe.pdfIn PDF document text
    • https://go2germany.ru/files/file/59830408583.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/vilisoput.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/fojunivukuzibad.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a5437cef2b41ae6faf91df6128af23fd/zivaza.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/jitoniwomugelana.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76de1664e---91701317744.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b319e693aee---noguwakuvav.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/104ccabb9a6999c8263c2877d2ebc988/gaxukerejapoxezi.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/woluvotazupoju.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/851dac38543f30781ab750d60e5a9257/72985712559.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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 19316 bytes
SHA-256: 15d47fbe8fb8ce569595bd60f1795aa2a7bd9fd0109c28ae207f3449f1bf5858
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 10848 bytes
SHA-256: 2c69c6b3d34b32b0354ccb6ff84cdc152df7c3d9661e12bfc62ef1d28cbdee2e

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