Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f865367a4472d3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 00:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dae2d7ffdd571e72b18d09c1a35ad504 SHA-1: 63217ded96e0c2572113b4a84ca6f9cbb7abbb38 SHA-256: 74f865367a4472d3e5a8649c3196bd81d93a12f4ae7a4b07afbc9f2ef9f9e01d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with several URLs pointing to compromised WordPress uploads and potentially disposable hosting. The document body is heavily obfuscated and does not provide direct textual clues, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://parlagame.net/calisma2/files/uploads/41569945957.pdf
    • https://tvsporedi.si/vsebina/46276529347.pdf
    • http://umhouses.com/uploads/files/32794325054.pdf
    • http://medob.org/SITE/files/editor/file/lazurefiz.pdf
    • http://songpinhao.com/userfiles/files/53975997303.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/29981922120.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614374fc3dc08---tuxadivimajegiw.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/82585606875.pdf
    • http://paitoonbox.com/userfiles/files/jirazojilotipune.pdf
    • http://mq-water.net/upload/fubadopoxigoxag.pdf
    • https://retrofitoman.com/ckfinder/userfiles/files/rudegosageledofudub.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8df63f385---51607207672.pdf
    • http://fcgo.tw/uploadpic/files/11463339212.pdf
    • https://agentcctv.com/userfiles/file/86370314774.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/vogivik.pdf
    • https://rozynoklinika.lt/userfiles/file/nipikidusemozefikugixeda.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db39be7ed1---89078821459.pdf
    • https://pointwebhost.com/calisma2/files/uploads/17225799281.pdf
    • http://www.alfapilates.pl/upload/file/70501351710.pdf
    • https://sankaibearing.com/userfiles/files/36599167916.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/9288285977.pdf
    • http://hurtmar.pl/Upload/file/10096493167.pdf
    • https://clubkdo.fr/img/pics/files/zufegetelujezew.pdf
    • https://dom4m.com/userfiles/files/sipor.pdf
    • http://menifee.hanasushichoice.com/uploads/files/bajuzobulujawirelalu.pdf
    • http://sandlnae.com/data/editor/file/94238287326.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=final+fantasy+v+apk+mod
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
font_01_sfnt_off0000f420.bin
c6b1826d8c6803f9786631fb0327bc41ed7e7651a020b080c295c51fcdae816f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10676 bytes
font_02_sfnt_off00010c93.bin
19b4edff3e230678f565614b1b18efcca956b1715e7ad51d9e8486a5cfdd5eba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 18992 bytes