Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dfacc34853ffb6…

MALICIOUS

PDF

89.8 KB Created: 2021-08-17 03:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89941d32919c0bbe04f799bc31c10bb7 SHA-1: db1dd7e2443a9a4b5e114bcf867a3f8d2f686999 SHA-256: 38dfacc34853ffb63d43be6c6f1e339f88651ace53fe08fc7c8551bae5b880f9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple link farms and compromised upload directories suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://abwcoliseum.com/uploads/files/govutedeb.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/70253220564.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aedc37e58b---vojakubagim.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/nujapafufobewurufaru.pdf
    • http://canhtoanland.com/upload/files/2330706731.pdf
    • https://termoformat.md/img/files/rebirijaxokaxexuvuj.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ddd365fe027648535b325897af29af2f/73997731896.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b510864294---zezuzozixanoxorudedazak.pdf
    • https://viessmannboilers.ca/fck_upload/file/69748611530.pdf
    • http://manpukuorder.com/uploads/files/zazaponemi.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/75843880356.pdf
    • http://rialta.ie/userfiles/files/45641660268.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/27638633303.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/o0jmru74ljbq3r4h1kurq7r6j2/lonupodokuzanab.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a055ea7cbc---kirupi.pdf
    • http://mopron.ru/upload/files/zuposewivojegi.pdf
    • https://jotekonybakterium.hu/userfiles/files/89467970769.pdf
    • http://vistobrasil.net/uploads/file/desojewo.pdf
    • http://shippingengineering.com/files/ckeditorothers/94839967178.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/lodawokekusapuwezuponewu.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483eb50be2---71388792299.pdf
    • https://congtydaihai.com/upload/files/losalajim.pdf
    • https://stallion-international.com/userfiles/file/52263834717.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a0bff445943f0481dd841d2befa02cc3/lifikanoxexowojel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=right+form+of+verbs+exercise+with+answer+for+class+9
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e381.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 16792 bytes
font_01_sfnt_off0000fb92.bin
0ba07f6d54a4cb2ae74247f97c6a926e6d6308299df35fe3bea2e399aa3885da
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16336 bytes
font_02_sfnt_off000111cc.bin
1b12b2b2a2f6797d39286705f23f9de7a00c06666a4b1f4fd13dc17bb3d1ddfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 11392 bytes
font_03_sfnt_off00012c93.bin
beb64f176bb0891d51825168f63f9fd2039e94b07b92e4c46df7362ca5950898
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 16408 bytes