Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a9c2dae9c08981…

MALICIOUS

PDF

88.5 KB Created: 2021-08-08 01:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73e6eaa219be4794c2b0515171df2c74 SHA-1: 886463f4c38e31f6fc9eea7e833ff306d0c9ebdc SHA-256: e6a9c2dae9c089817aafa2d5631e29d62fb18c631223c8ec73d7799a7708f647
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The presence of a link farm pointing to compromised WordPress upload directories suggests an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic where the user is instructed to provide a password for an archive, likely to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/v19eutsdnb9jvsm2cocbjrh497/99074168732.pdf In PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb6b89d88---mojenajaduwipadavas.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/e454b94d50805360348eae4afcf56adc/rigazazipakuvapufewaw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/anj9u86rc1mt17inm4ip5hlrr6/39529945075.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/relinofutukovenago.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/wukidisawanoxibugewo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4fcbf5d22d28b89fb913ee9dd74b4f09/71648388537.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/78898652589.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/17885538267.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ptkhicv3j8fh7or8nt55a11sas/94848766450.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/8878365440.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/tomipiki.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf74ba64f9---buwipevaligarakosotegenu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b50f4967c---41479189708.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba39fc333a---20735290492.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160855f1fd951f---94065132975.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/zojijugibexemoweneribo.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/2950939413.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/22914392365.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85123274382.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7134b5f7fe---tisonebaritivoru.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffee48a114---jalodazakom.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/sapuguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+check+my+data+usage+on+t+mobile+iphonePDF 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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 17324 bytes
SHA-256: e2de823a7b0818f6d6b616116e86ee31db8afed57c4753bd821ff79109a1cf33
font_02_sfnt_off00013a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8D 11384 bytes
SHA-256: 5ffb4b71371e94d77284370fce53fc77793ae3ce72708413014994a7e0bdfb9c

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