Malicious PDF — malware analysis report

Static analysis result for SHA-256 597a3d6c48c9ce98…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 11:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 298dd623b1c89e63f657a5bc9910c034 SHA-1: aa0efa0d434f11e967b1f4471b5ddfe9bf6c6657 SHA-256: 597a3d6c48c9ce98c9c8b166c3f9182ddf15fc70d4ee746e8ba0d68edc3c0977
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sieuthicayxanh.vn/webroot/img/files/66895973034.pdf In PDF document text
    • http://mobilni-kadernictvi.cz/files/file/57094177767.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/26708109413.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/35809634931.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210509212946.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984ba423fcb---13692988731.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l7c9dn8ga1lvpedk7b77fd0isa/47733373300.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e783605d61a---kakegelerofej.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a7832cf957b00d88eaf05e408d0daf95/43030986587.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/37161943139.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/49a35d8afb1f9ba5d5460f1bbc4262f1/pirewogelemaxisiruma.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8fe28f6f49affc04c9376f3ae67c9aa3/jadawedofuxakifejuwaxakex.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1f9af434---wejavafurarug.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88060133986.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ed7ac55c5d8056e027603430585f0c8/18753198632.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25f7938376---33850918205.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/8883652648.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/91293733970.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1973df1803---lerazototaposodenidu.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/45762616482.pdfIn PDF document text
    • http://topas.lt/userfiles/file/51327101350.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/cad10fcm8kmr0p1rkq9lef4ii6/98143285386.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/vezobadopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chemistry+of+carbohydrate+pdfPDF 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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 17016 bytes
SHA-256: ba750e90f2cb91c87da2f6371e9a8c9ca0ea9c2a515ead605090199751cf71c2
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 11020 bytes
SHA-256: 390db0b3ce7aa99ded3a6a5402351acef70b068ef6ba4beca2b5ec8bb0228e6c
font_02_sfnt_off00012702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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