Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aa334ca783f679…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 05:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb4d1498ff809f5e0d9fa2858f380bf2 SHA-1: f143289425e435c1098fe9befeac2b4294d125aa SHA-256: 20aa334ca783f679f716cb3978d24a1a347d0dd7d5887b86a024dc99a7d31b3a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including those on disposable hosting and utilizing UTM parameters, suggests an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://daaeportrett.no/upload/file/suzizosovotuxinud.pdf
    • http://inannamsao.com/uploads/files/70249162639.pdf
    • https://newdesert.pl/userfiles/file/28205202263.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1923887d357c467053b3fd928e883d5e/vubilurop.pdf
    • http://alimentosldm.com/userfiles/file/83407837289.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3ccaf8ec---tidajosuna.pdf
    • http://noithatachau.vn/webroot/img/files/84517111709.pdf
    • https://ptkas.com/kingkong/userfiles/files/35460011682.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23d829300d---lulolaxufubolutifoviriwuk.pdf
    • https://bazab.ru/ckfinder/userfiles/files/kinatorerusekezefomi.pdf
    • https://i-intelli.com/ckfinder/userfiles/files/dixawafadizadisimudekivir.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1u54h8lmom4cn4p26v9aj422q2/23895571897.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fca5cf70c---paxiwumapitemu.pdf
    • http://nomorecpapmachine.com/userfiles/files/57462134230.pdf
    • http://jrpst.pl/userfiles/file/nanojulatimujex.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mu28fh9245rvrf673nglkntl0c/46211395216.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af999c55f18---85197104370.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/809f193596db7dddefb587a4521eb070/perodutulufikej.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/46751968938.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0eb0cb038---64850165880.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=2009+nissan+versa+manual+transmission+fluid
    • 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_off0000dadb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 16792 bytes
font_01_sfnt_off0000f2ed.bin
321ceffa8d201f0c8b5907e5108ea10812f0b2de137442a654126b1d165be789
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 18104 bytes
font_02_sfnt_off000121ca.bin
10463ea65f73b8f1b8aff0dfa54ccd2d6aeeab395a181bc77b5c57d5a29f8e78
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 10992 bytes