Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b34ce54a4ca875…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 04:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4dc0d2495ad69b3c613d9eeecb664321 SHA-1: 46978a1c8e8e4c6b0d98447b754302ce1d5f69e3 SHA-256: 19b34ce54a4ca875239f58c9c885cc8426019e819edc757dfe41a088c7e7c082
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified it as a link farm, with several URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The presence of external URIs and a raw IP address further supports this, as these are common tactics for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bimbrlata.cz/UserFiles/File/rabevobafigemidajepimu.pdf In PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nelumobob.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/vojesosofofolojew.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/1785450924.pdfIn PDF document text
    • https://salonrewards.ca/images/file/gagirisex.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/nogajutad.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/nusogel.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/44571729846.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/90860298758.pdfPDF link annotation
    • http://nwatchonline.net/userfiles/file/1095138481.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ab1b539c0ba859da0c49a27bd955cab3/20414090500.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/20186204902.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/sexemanexewaxogogexixof.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337a2059581---sepefeginog.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/zelonovosusabisatipodagad.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/sasulexekakip.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/nawegi.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/64198041920.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/24911211086.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138799e6669a---52883530023.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/930317986.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/8308170226.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/62131210907.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94eeb5b00---sekil.pdfIn PDF document text
    • http://synhbio.com/upload/files/reluzularutobisaxabidof.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/49579946817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=snes9x+windows+7PDF 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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10316 bytes
SHA-256: f72cf7acb3917faf750485593046aba2fe6b3893b6da1a23d8a66a5454242309
font_02_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 17488 bytes
SHA-256: 7fb000d7c9cbdf9eafcc5219a49526f2a95f2d2174391a10ff6e0cb17d19bcf2