Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca96fba76e0d6f5f…

MALICIOUS

PDF

91.3 KB Created: 2021-07-04 05:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e9c243c0c1f934c61d046f01bb65a15 SHA-1: e7a21f49e4f321cc91c14f95e652deaf3140899e SHA-256: ca96fba76e0d6f5f8cff465b2b16624a822552ca6168b58430068ec0649003b4
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sharon-barron.com/userfiles/files/54011947442.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2c58165f6f36db0cb9a8d291354b1aba/61518873206.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/2785769734.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e9ca9a03---bemovejabemav.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/f6b2ga7ptd0qsotn2pl5o7grdk/wapenut.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/73202984702.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/20e7224ef34cf48367061a737b157bba/vexaluzitetuxolunapur.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/nevituvizukal.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/3552f3f87f0788bf1b5a40a665d47fe7/78174766201.pdf
    • http://babamoleskine.com/files/file/fuzexumax.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084408611de3---dojadixuxobigoduvupo.pdf
    • http://restravel.ru/ckfinder/userfiles/files/joguj.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/106a7560a6811a89d241eecfc2c53b73/92506148824.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c8da812edb37905c9b6c4a2b8fb542c9/weribiwerijavarefedisepez.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/87e777bc5333b05285044459df67a199/43979616850.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/653c4df538310c793f0fd6eae62feede/xewomijasotitirekiwegi.pdf
    • https://travelstore.tn/userfiles/file/47465270091.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a597ed3c878---89517011643.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210615_074A42A12CA05A1B.pdf
    • http://polyalpan.hu/_user/file/3318896761.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f600e3516c---99549675448.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/35c9192a35e5f5ce373a89c569f36ca8/fuduxevarewutinasadugi.pdf
    • https://saksisan.com/upload/ckfinder/files/kituvojijewuxonitega.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7780ec60---wipeliribopipig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=example+of+quarrying
    • 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_off00010077.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 16792 bytes
font_01_sfnt_off0001188e.bin
bb73c24c70a5948ac6c351eeeb0bd19b20bc05f6cb47f8e8f3294c4b97c2956a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 10880 bytes
font_02_sfnt_off00013151.bin
911097abe09742db8477fe1ba2801f6a8c9d5226bcd2a967f74fcd6d454212f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 18132 bytes