Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d155c889f4fb52…

MALICIOUS

PDF

97.3 KB Created: 2021-07-07 19:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c711f30f3a78b244f57db4b15fd0fff7 SHA-1: 1e8a41bb3234bce9561534d7439f4fbf67f54218 SHA-256: 87d155c889f4fb52b27c77e2a232648f68ce10e81ac21daf2aa333d99ef5f317
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf93ecbc2---tiragawoxef.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f96a0bb2---98007897342.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/30704914636.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f331b378---42336566450.pdf
    • http://jnnycc.org/userfiles/file/xoviwodejinoteleg.pdf
    • http://citysuji.com/ckfinder/userfiles/files/wijojoni.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bu9m7nheqqbc3nskl18bbv6sr2/kexanuxorifikitufuvi.pdf
    • http://meteosputnik.ru/userfiles/file/34020973343.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2dc5563c8f467efa03d57418ee609ed1/gupexajeruso.pdf
    • https://lotte-ppta.com/beta/assets/file/30869501478.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6af92286---96099755314.pdf
    • http://pratiklinik.com/img/userfiles/files/losunis.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2b5a9a536---fiwewuv.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v5tkkv1eb3f7rtjt8ovgeinkr0/tokorekazidi.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ivm420k97nuhttmh4k828os902/kunugaxejawamitepilowin.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b975073f6---zulomavudonadenirow.pdf
    • https://aprilboya.com/userfiles/file/majir.pdf
    • http://files.ibiza-ferien.de/file/43537070568.pdf
    • http://highgaincomposites.com/img/file/20216192539.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1b4c27d7---49773761602.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160971cf3a4098---17457474518.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2218a88859---vedonemuzotuza.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/dfa3c2cef5ba32406bc35b38dbf01efa/rikuga.pdf
    • http://feach.ie/images/uploads/file/tarumagulux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=branching+fungal+hyphae
    • 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_off000119ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
font_01_sfnt_off00013201.bin
cf995dfce7e5a1b83c4c12cdf2c8f350854622ca75815e3d6180a4b4c617eb6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 10640 bytes
font_02_sfnt_off00014a47.bin
6a77818ed656c3b5601880a84a2a0049dff5a2d31068acb50cac5e8e2512bea2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A47 17400 bytes