Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab35ac2e0358e8e1…

MALICIOUS

PDF

85.1 KB Created: 2021-08-10 08:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c5e24ca562f7a369a8450522cfb88f25 SHA-1: ac50f212b189a5662be14952873f953a3942e2c3 SHA-256: ab35ac2e0358e8e112c96ba7f2f762dbced9e02c7a5761a496385f13ba6c4515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://emrc.ie/upload/imagecontent/file/litatesewoxalevexiwo.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb60a709a8---28317886810.pdfIn PDF document text
    • http://mavachhaiphong.com/upload/files/20148905196.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/hm7o0kmrln756n2nrs4hocm57h/bewajeraleregis.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106270348387383.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/semegojuju.pdfIn PDF document text
    • http://deltools.com/userfiles/file/paxalamu.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/wujomavonudajaw.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/dagopokuzubabodesonebe.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8bd7d0d6---mewababaguxubiratesezer.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/79522673642.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/52064888925.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5add9c054---7421383470.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/sorotiz.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/pju8br4f9s596rkgl5ru614vvt/sigilajomivevejufasusaf.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608eebe3ca692---41514815061.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adde42db7d0---71265736764.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e5ab73be49a8b6a7a0e5731a002f41e3/bipikato.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nsv46oica3ua3qj3egmdq06jk5/95892108892.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/51603770587.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/5686966982.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/99477038081.pdfIn PDF document text
    • http://yilip.net/userData/board/file/2557436531.pdfIn PDF document text
    • http://scpt.it/userfiles/files/dubulatutizuk.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/biribe.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/nukewulujurigasurux.pdfIn PDF document text
    • https://lonnebacka.se/anvandarbilder/126/files/33912871697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+sims+freeplay+mod+apk+ipadPDF 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_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 19168 bytes
SHA-256: 8805825575c1865d8a0bff632147ae4bd96f10d752a60340f8dd88a2dce1df81
font_02_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 10728 bytes
SHA-256: ad513deed1b3ad12df4b818cc2180c3e500c1dff7757a203cc9eef7c9841c820