Malicious PDF — malware analysis report

Static analysis result for SHA-256 2013587d78ad3323…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 01:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 66abb3015099891b1300f090ce93c18e SHA-1: 8605347efcca92fe8db54073eb77bf93a1c1ea84 SHA-256: 2013587d78ad3323be7cfcad22ec9d3ba7cdc1920c802f496a54126cf0eac3ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV. 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 clean score 0.2222

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 https://chcial.ru/uplcv?utm_term=kopaczka+konna+instrukcja+obs%C5%82ugi+pdf PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd80c8625f9---38521845288.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns6fdov7tl3120g45p9fpdaui1/65397357758.pdfIn PDF document text
    • http://nenorm.com/files/files/14246563584.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/30ef9b23ba2965b3ec1489dae1d6d560/sejov.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/2319221962.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829c800dc2f---5749293501.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qf017t9bcnoio1ebghhbn7iap1/lirosine.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/fenurodeberevobulijolubi.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/disujaginavaxegawuxamifo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d964f218---21459086082.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/givujajatefisoreku.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7vnughittacaqudhtho572sad6/33892826933.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210719_DAAA81A39AA16176.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/41145578407.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7475f60e1e7f64a20611e8ff0dea183b/jusiketodedejola.pdfIn PDF document text
    • http://www.heksan.com.pl/file/7942390196.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bedc381414---26339422329.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/mapukesetuj.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d5774bdaca1a030ee03d1826f6859a06/56244235414.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/gukatimedax.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/92e7255494acf07dc593b3e17aecece5/20527487917.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/17862290869.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/544889978340a59178a564f0eb23b168/30273990740.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c6c097d4bb0270d6571d1556d143488d/suvokekutidobi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08C 11200 bytes
SHA-256: cbf27c9a87383ae26c8ae34cfc576f4d271965f061a993ea8590dd3b49f05746
font_01_sfnt_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 17676 bytes
SHA-256: b6c4efeba6d3bf46b2dc37cbe9aafa04a9405eb52d4d3217ec2154fe31b5cfec
font_02_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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