Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3253c23ee48882…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 18:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d337a8c21a09fe73c500dd9756345c3 SHA-1: 81743ca39525cdfc56a15f0abcfd25d5684cc8b9 SHA-256: bf3253c23ee48882b58ad41274369e3ecf03d00d050f865e4219b7d672ee559b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs that form a link farm, directing users to download files from various domains, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://garglob.ru/uplcv?utm_term=descargar+neo+bomberman+apk PDF link annotation
    • https://himalayanwanderer.com/himalayan/userfiles/files/motigel.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144934e1203c---35900374002.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/selunazotelizuv.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161410dfa09428---94990589101.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/bevotunizozufajufevopuf.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/nafanoxidolilumowixowo.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109051127376619.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305aced8d05---17753517162.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/zumuj.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/73162606629.pdfIn PDF document text
    • https://izometal.net/mm/file/gulelefutudosek.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/11927298151.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/rerebuzolel.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210919_E75D167842637347.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/76138691333.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/60374528544.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/gatumusaz.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/debumusupor.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/limonilebenosux.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/56646357073.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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 10712 bytes
SHA-256: bbf7a2ac0ca6432000d54fec2a8dad7558fb1c84bdcb176e929cd7226ca328d3
font_01_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 19356 bytes
SHA-256: 36db3c3375968f4a2b44685462288c623cdca5738be20a22554fbbc2d039c5b9
font_02_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1