Malicious PDF — malware analysis report

Static analysis result for SHA-256 39248d8bbe035212…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 00:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de0864eca80d1c7854192a02beb5276f SHA-1: f4e05834e7e0361e31d9ac45d9907d6cb272c01b SHA-256: 39248d8bbe03521246c82d25f271b4ad428697b17f7e9a7781559e6c9181c34a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to files hosted on domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest an attempt to lure users to malicious content, likely as a first stage in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://odontologosmalca.com/images/userfiles/file/pofuxokagoxewukedumakes.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/tatirafekubipekipor.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/567cb4356c757564116bf3b0114c387b/1881704217.pdf
    • http://togclick.com/media/userFckfiles/file/debazegupejamux.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/sezonerare.pdf
    • http://tacchigroup.com/public/thread/risorse/file/jufovobenuxudazozojew.pdf
    • https://alev.az/userfiles/file/vosuvesozepeza.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/94735878761.pdf
    • https://pcetravel.com/files/file/guxonuvokexi.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb07762168---38044485163.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8e93ae656fb685cd7dad995378bc3303/jenejop.pdf
    • http://fixafilm.se/userfiles/file/77416173909.pdf
    • http://helenhotel.vn/upload/files/zapejigejagozogapegokeb.pdf
    • http://wedooverseas.com/userfiles/file/rokewix.pdf
    • http://aaykpn.com/uploads/editor/files/venakawepogiwa.pdf
    • http://szyqjsj.com/UploadFile/file/20210905045447373.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9b411ec2---96709939410.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/16739581476.pdf
    • http://jgbt.us/pds/userfiles/files/12001407968.pdf
    • http://sattosushi.com/uploads/files/58744682348.pdf
    • http://quaretti.it/userfiles/files/livipemoxoboxowa.pdf
    • http://benly-carson.com/product/files/limatamarajefasig.pdf
    • http://www.supair-lux.hu/ckfinder/userfiles/files/gejonam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=good+night+shayari+for+gf
    • 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_off0000b0a9.bin
e3530244797179a0982defe31c06e3ac668375b3572faa44a547ac68917a34f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 10608 bytes
font_01_sfnt_off0000c8a6.bin
0d8297744f82c328d8588090b6d82031233ec48d8052ef8a88bd948f07d96feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 16384 bytes
font_02_sfnt_off0000f251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 16792 bytes

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