Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e17f5b1ced8ae4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 23:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5258adfc80ebaed3c8d55cf84c8b23e6 SHA-1: 10680c2dc6aac4f9a4df7820337be7d5c3609227 SHA-256: 31e17f5b1ced8ae4147fa79c82c0bcef5a485c82597688275047b90f04ae9afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nessium.fr/userfiles/file/femixevip.pdf In PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/50926194335.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/23900107210.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/69663790121.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/tikowivivokutuf.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/83476082053.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ea96f1e687ea39cb98d97efcc2ace9de/kedixivamutan.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/88772303898.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/bakefolijuxuguzugelutof.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/94884528424.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/rugunisitof.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f40f91a53---kefolazagowokamezufekaxi.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/92395007861.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/30353494366.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/vugized.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8k3v4t12fuia4tra55ofeik6h6/moxokajowe.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/giminanetow.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/dujojeb.pdfIn PDF document text
    • http://nessium.net/userfiles/file/megeviwukiloxadepina.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/zelatil.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/jigixuroboveterazewi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/8178867880.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/41878447918.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/nupegopabezulogarozokogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+transfer+data+from+phone+to+laptop+without+usbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 2132 bytes
SHA-256: 8ad1629d78958631526aea0a74d0b163a5252944052d54f78beed5240939c1a1
font_01_sfnt_off0000c397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 11080 bytes
SHA-256: 085b8199a4865c63c86dd5163ec35895fc976c6177a4c8b5b5babb76a15e875c
font_03_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 16456 bytes
SHA-256: 9d387a5936834dd304cb6fb33d9eeccfc7e017ba1a8898a7162c2e0ebcf21e6b

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