Malicious PDF — malware analysis report

Static analysis result for SHA-256 8228776645d4cd4c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 09:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e866e96cabd1e0834c2066ee30dac0b1 SHA-1: d8dbe8a6c3ad9ae8e56538295891f6c84d556ce6 SHA-256: 8228776645d4cd4c969f0b4e1322fba04dbb1cb3ef202fd019de27d02cf125f5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=the+little+engine+that+could+pdf
    • https://capitalsyndic.com/userfiles/file/66411040646.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede3608fb5---xorafuresumiji.pdf
    • http://omegapizza.net/uploads/files/padubixanumomakisav.pdf
    • http://begues.mobi/userfiles/file/39340288411.pdf
    • http://kxnjl.com/userfiles/files/digamasurit.pdf
    • http://rqconsultores.com/userfiles/file/96130481508.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/58276053276.pdf
    • https://penzion-pod-rozhlednou.cz/img/file/tedagovapepuj.pdf
    • https://pvesc.vn/uploaded/file/99779461008.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xezawi.pdf
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/71913110098.pdf
    • http://goforthegreengolfpools.com/userfiles/file/zupilinir.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08691d9e7---71123865423.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/lotorasikubegu.pdf
    • http://www.jindatunnel.com/up_files/file/nekunevemegufen.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/br2o9h6tpkvv1ulsu2lvf0grvp/58534169430.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/gokokuguvolezixetuvos.pdf
    • http://weiken-rc.com/upload/files/sinexinaxupeborokinu.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7459a466a40ff7d023880f998d616679/69434686286.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/rufumivojajeliwatoweto.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/39128816071.pdf
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/lubexojoruserofad.pdf
    • http://jungam21.com/upfiles/file/1631082432.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5970eca7---sojurixekuzixuzawaz.pdf
    • http://buren-kompanie.de/userfiles/files/mojulowujoxuxufexotatev.pdf
    • 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_off0000da29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 16792 bytes
font_01_sfnt_off0000f23b.bin
9513d1612eeb40d983989e0470cb5d60d9336ffde026e5cf61392d64b7e5a94d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 18360 bytes
font_02_sfnt_off000121c4.bin
80cd58b3271449d6c51df063426b56e3377de68c9f80d375b236084601ae79c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 10692 bytes