Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe62e9f38f1a4b44…

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 12:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cd304c84d136f9df19c5377c6fbf0ed SHA-1: 154b8fce7622c223f11ae98c9124100ffcc5e188 SHA-256: fe62e9f38f1a4b44bc695c819985d2640a2ce670e172f51a973bd5fd081626fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting domains. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

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 https://sluganarodu.org/userfiles/files/44373230962.pdf
    • https://vinaconexmec.vn/uploads/news_file/titaxuzezivexexuzulufulu.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a5885782---55941387226.pdf
    • https://kotypsy.pl/ckfinder/userfiles/files/40305762796.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645fe1b199---xazorimidejewiturekogi.pdf
    • https://worldmedglobal.com/userfiles/files/pisozunejur.pdf
    • https://cplastik.com/data/cms/file/25679116653.pdf
    • http://asude.istanbul/ck_images/files/4716054160.pdf
    • http://daiichilogistics.com/uploads/news_file/kofiwopij.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxitututom.pdf
    • http://ranchobg.com/img/file/53091703890.pdf
    • http://jrpst.pl/userfiles/file/81153159082.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa923c703---1569761232.pdf
    • http://identik.hu/editor_up/87910463664.pdf
    • https://mobspace.xyz/web/img/podborky/files/3248314312.pdf
    • http://pastadimatteo.com/ckfinder/userfiles/files/xadivanekobeza.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/73022886764.pdf
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/48570709225.pdf
    • http://westhollywood.ilovepokebar.com/uploads/files/26197851365.pdf
    • http://chiangmai-clean.com/user_img/files/8080246549.pdf
    • http://younewstoday.com/task/userimages/file/duzofijeteru.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gamer+wala+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c448.bin
b40c85416e51003222532095d535eab0c1e31dac829747f7788f1ffe4d1a26f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 16780 bytes
font_01_sfnt_off0000efd5.bin
90dbf1bc5418bed485d5d013dfc0c833155d8f1b6e35465098034b4103c149ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 9956 bytes
font_02_sfnt_off000105ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 16792 bytes