Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1eee76f6ff0e17…

MALICIOUS

PDF

93.6 KB Created: 2021-10-06 08:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3510ee7e2b3ef360e15194528c9bb703 SHA-1: 215ef901f39a4ccb7cb238535bfc9579a1639750 SHA-256: 6e1eee76f6ff0e1748fbf20bb952687421fdec2a5e378107b38cabe591f83b22
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to potentially compromised websites or disposable hosting, which are indicative of a phishing or malware distribution scheme. The high-confidence ML detection and ClamAV signature further support its malicious nature, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://efficientinfocomm.com/ckfinder/userfiles/files/nepekupiwetadoruxeji.pdf
    • http://devitohomesorlando.com/userfiles/files/48989600646.pdf
    • https://ylwlgwadmin.ylwl.cn/upload/files/12356697055.pdf
    • http://speaklifeiamgreatness.com/files/files/ribodububexirigetufufemu.pdf
    • http://creationart.hu/files/file/gabujabogituvuvekuvuwaleg.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/85721757245.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/58410778426.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/18499430917.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16156a3a92127b---volivawiwiluberape.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/jatesozumovovidaruripige.pdf
    • https://peperita.it/writable/public/userfiles/file/puduxinejefefojovi.pdf
    • http://nwatchonline.net/userfiles/file/tezexetala.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d204b8f97e7c814aedc52fd62fd232a6/mokolotuf.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/88909148644.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/juboparoti.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/69836750951.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/19134537576.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/guzirokabe.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e7c3a95c1f0cb101f8dae258d0d9dc99/xodekufikanikebivizifema.pdf
    • http://abdon.madteam.net/ckfinder/userfiles/files/91832098398.pdf
    • https://technoarc.net/userfiles/file/74947072687.pdf
    • http://mexvp.com/ckfinder/userfiles/files/31737934448.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/fitetovenoxozafix.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/fabel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=winchester+model+12+disassembly
    • 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_off00010421.bin
1d40cd054944b08b4cf3e5ab882be2176acf1f05d12a57cb65c70fb611d5373f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 11056 bytes
font_01_sfnt_off00011dc5.bin
5356f6d673c0fee4ec4efbe75b209ebbf28a7cf2b2fa338697fa5ae4ea989025
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 19360 bytes
font_02_sfnt_off00015050.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15050 16792 bytes