Malicious PDF — malware analysis report

Static analysis result for SHA-256 af337dd3de1fe4a5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 13:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0aab7328b05c8bc127ff6e1c75f3cd6f SHA-1: 230d0c68c37b508605c9b9457cc73f70670765e2 SHA-256: af337dd3de1fe4a51745f217c8081695a378b307c6c000e16be261d2b9d7260e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links on potentially untrusted hosting services suggests an attempt to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://businessdevelopmentcenter.pl/uploads/userfiles/files/lasejawe.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2459f236a1f7411c2eaff36313f7e87a/xeganatajetorivir.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d6e6168caf393ee14b266373919a6ca/bosirivuwelewefavawoves.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/xopojajemafopejig.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/nepaxemelufow.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/76156835.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/varorowaniwuxapuxusov.pdfIn PDF document text
    • http://lse.hu/userfiles/file/98042672032.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/10575918425.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/koxoguzefas.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/kodivaluv.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/25595204369.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa99dbad1---4996583612.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/33651832483.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/19460196462.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f733ac8a---69700854464.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/lejafexituga.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/90puhj5lp3fj5ugkklimjfkoh4/xisifikovomimijufo.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/13567223107.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/97947184060.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/85226666441.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/sininomedolite.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/11147176264.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/xekesigej.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df7f033d8---xumobijapisepotixu.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/51643966725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+bachelor+australia+season+7+episode+1PDF 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_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 18288 bytes
SHA-256: 08d0b52b4b3fd5b1d35a699ab055fb54be7f3e15ec4d5c4a9a5dea89ccbfd20a
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 10916 bytes
SHA-256: 6d3bc460b63575786451696bc6be7063c67c75e40b86a8b6cdfe98d76179c3a0