Malicious PDF — malware analysis report

Static analysis result for SHA-256 50db6250a2a8edff…

MALICIOUS

PDF

70.0 KB Created: 2021-09-03 09:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5fd7d68b51a114363dab527b9cf39f53 SHA-1: 551536d67a9a9283949fb7a9a439e63edece1f67 SHA-256: 50db6250a2a8edffbd8ec698e7655b5c07e66effbfcce841e69405671049dd70
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://irlanc.ru/uplcv?utm_term=guru+mann+keto+diet+meal+plan+pdf PDF link annotation
    • http://babamoleskine.com/files/file/6633410962.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/74831899083.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/lepokoderonen.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4a599726---91174586994.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1428be01---28524064023.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/nuwola.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607108a568b21---5503509631.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5f0f566b9---lixozab.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b412380722---46836370848.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bf36e2458---38306319792.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/dosalapipawexakoz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/plag4p6ouq6b68obppkka5qm35/58140593813.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/pajotosevejazujubonax.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/kijasokezibulupezosagexod.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/328560826.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/vatab.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/pasawodipaka.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/52479844118.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bd64640952a456d3f7fecafdafd9f489/67244107668.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/25881460427.pdfIn PDF document text
    • http://tayles.com/uploaded/wedopiwogapuluvanexowa.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/wuwogopixisen.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/38627866379.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16088a0412cafb---54166566276.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/kuxemixepazulojile.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_off0000b644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 14348 bytes
SHA-256: b48a3e79a56f0feb4cd54ece08adce43e28560c5451e93d065c5f0b5882f032f
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10720 bytes
SHA-256: 63538b9c1fbbad84b78464eca4dc23810be383b24d3e9c5447e876f9789a0a26