Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aff93727399e3c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 09:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c14587e1afac82f9b975a52a3a72bad SHA-1: bd75e2f09c0bfd2b39a56b4562958358543994bb SHA-256: 72aff93727399e3cafadb101262985560184c686820cf9664fefc4de1db36b70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://palakkadtourism.in/ckfinder/userfiles/files/10257547588.pdf In PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/xofefe.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5ef88a5aa37d738e104973d830ee3046/18059998929.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/89207141434.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/32816681515.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/dipujegizazija.pdfIn PDF document text
    • http://maksimetall.ru/files/69129720879.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jugijomelifatuburogis.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/2719987970.pdfIn PDF document text
    • https://laser123.com/geektic/files/33884239551.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/musixoni.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece8d08b1f---59722130198.pdfIn PDF document text
    • https://gangnampools.com/contents/files/23967448240.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/mupekizofojusutovisuz.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109151742373579.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/77970687862.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92733599719.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/kuvide.pdfIn PDF document text
    • https://melz-feu.ru/upload/40679210533.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4c373edf---67146750132.pdfIn PDF document text
    • https://lordoptika.hu/files/files/vubojosawogifutizopumup.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/49039682342.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vunome.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/13999729758.pdfIn PDF document text
    • https://fototipia.hu/files/files/padoxofemowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+create+apk+filePDF 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10520 bytes
SHA-256: cb627f618bee184ba6fc3803f0b983a05ff78bea0e68e05c8a8d12b83fdff646
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 16980 bytes
SHA-256: 09ef68bce76774e9611d694c4db819e2f1ef9c04f2c282c21cf0b4424d9fe81c
font_02_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1