Malicious PDF — malware analysis report

Static analysis result for SHA-256 344924059780529c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-21 02:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de6a695b8371d620c8757e2940d98482 SHA-1: b7ed7ffa6f3b4045ceccd15c03f1803653cdbae5 SHA-256: 344924059780529c70a4b3c04c75ea1fc279af7da05b313c73ebf1da4e41426a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://ketchas.ru/uplcv?utm_term=wipe+the+cache+partition+of+the+phone PDF link annotation
    • http://jan-fotografie.nl/upload/files/46163030532.pdfIn PDF document text
    • http://peoplefoster.com/pliki/zipotidotagimik.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1384528c---lonukofefitiwawujati.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/luwenobiwimov.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/wubawazosikobikosivok.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fokarojebegelamag.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/6952026942.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/21457088578.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/50545134e87908a79aa575b1c15e13e1/10575178519.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109172050214122.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210904_F7B989C3FC848F87.pdfIn PDF document text
    • http://foodchemsino.com/d/files/28268549696.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210918040639.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/24197234836.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/xuminopupekaba.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/19590940786.pdfIn PDF document text
    • http://lagrupacio.cat/file/35684575996.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pnbi3f9irfcoe8rmo0h9o12s00/nebazowolemegawora.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/ruwomegebobadiwavesigifal.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/mobekekuvenapetewiliz.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/duxivewufam.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_01_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10356 bytes
SHA-256: 469e4bfdbbe3985a56dd6e716a9f4f61d3c22810f21be719ccbf722fbe649faa
font_04_sfnt_off00011455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 23672 bytes
SHA-256: adc19c28d0dad176017e143c56f05c7b04198c8db168d71b7e64b220201a43e5

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