Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f08add3f4e4aa7…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 11:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57db63fc9f1b4b53b357787a0ae81f05 SHA-1: 3fd13ea6d3871fa1fa215597b16533960f6b387a SHA-256: a1f08add3f4e4aa774d5488f23b5a9ce612f77fbc8bd171dde23b1f77838859d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to user-uploaded content on various websites, with some hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://studioarclab.eu/userfiles/files/babukape.pdf
    • https://htcpost.vn/vietpost.vn/img_content/file/papagiruritutupuw.pdf
    • http://tabletopad.com/images/file/31994601725.pdf
    • https://marcvandewiele.com/userfiles/file/tidurebababafufowijew.pdf
    • https://khabul.mn/mmpa/userfiles/files/guxedezojux.pdf
    • http://gaia-onlus.org/userfiles/file/48822283100.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/79168422283.pdf
    • http://hamkr.com/userData/board/file/rupijo.pdf
    • http://cuanhuaabshanquoc.vn/files/15359538883.pdf
    • http://hycxchina.com/filespath/files/20210913044351.pdf
    • http://serenetour.com/image/upload/File/jofuzok.pdf
    • http://potlista.com/file/files/risokax.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/dovonanitolitesalagudo.pdf
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/dugonajabeperotilugewotex.pdf
    • http://nfc-lampang.com/user_img/files/rojaduvabiselo.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc306d83a---vefedemamopug.pdf
    • http://a1-automotivegroup.com/upload/files/sodimojemilofezetuseb.pdf
    • http://associatedreclaimed.com/userfiles/files/sinevitomexovol.pdf
    • https://fotojursa.cz/userfiles/file/30245109776.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d457bd1ec7dbb63872cb8d494ea89a02/52087348267.pdf
    • http://bibliotekaszamocin.pl/img/upload/files/zonuxugawomafariz.pdf
    • http://fkjz.cn/upload/files/2021/09/202109190631539976.pdf
    • http://kesifveotesi.com/files/16863025770.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469d3242686---48592018785.pdf
    • http://frigotechreina.com/userfiles/files/69349703253.pdf
    • http://vekosgroup.ru/userfiles/file/xikifeponizur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=aplikasi+alkitab+android+terbaik
    • 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_off0000bce3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 16792 bytes
font_01_sfnt_off0000d4fa.bin
cc74ce39e140ecec55cb134150aaf0fdb78655725505e1dfb47e5760138cb7c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 10600 bytes
font_02_sfnt_off0000ed19.bin
c4adfed6d719aced95381e38bf854d84606997f00dcb69f1c09dd446f73424d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 17084 bytes