Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0da1374fae2113b…

MALICIOUS

PDF

91.2 KB Created: 2021-07-02 20:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdb230040d42360a3f830055d2cd5f4f SHA-1: 46a2a5e6beb7f1ad8ac3a7fb0505b7b5828f3948 SHA-256: b0da1374fae2113ba2d1152824c4383469dabd0bddbb9f5b595354d0d2363ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous URLs pointing to compromised WordPress sites and other domains, likely serving as lures or redirects to malicious content. The PDF structure and embedded links suggest it's part of a link farm designed to obscure the final destination, potentially leading to credential harvesting or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://catamma.ru/uplcv?utm_term=study+strategies+for+high+school+students+pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rn0jo4oqpok8j0cq9jprvmrk2m/liwopibifojuwiruditidaso.pdf
    • http://fresh-j.info/images/uploadedimages/file/dikojijudijinemulukuna.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1bb2f5f14abcbff942cfbba82c0b9de8/21694095876.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/771fed3057cc50a52d5ea38e43ecc257/wasixanumoveka.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb28e6a643---vuzuwav.pdf
    • http://chalappuram.com/userfiles/file/madunukamekewixojomig.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7757d7e0---49803968237.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f825bf2676---13389717689.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2hs395ktga6tsv5sjb80s9dq92/rawexon.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6e453593aeb7104bdd4d62fc0bcf14ca/62527068483.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ddc7657278bbd50cb30a71a4a6122ce5/gepuvulif.pdf
    • http://mya1fc.com/files/ckuploads/files/fujixagu.pdf
    • https://airbays.com/userfiles/file/72100804406.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/70881386800.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/jb8opdpt12n4mu6udu8hfr19n5/81013258517.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607addf8a301f---nixula.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9jitvoc166naqs6i90abvppqpil2r8s5/97817494664.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da59aa8239---dejukevirokuxafijobek.pdf
    • http://work4shop.cz/userfiles/file/12457861939.pdf
    • https://hyundaia.ru/userfiles/file/jidolorosewefawebabapeb.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29fd48e4cf---ronafibutotunutomobidote.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/58978193929.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lv2m9rdu3dme5emql839g0gvus/sotusunav.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072b67b57be2---tunak.pdf
    • http://linpus.com/app/webroot/userfiles/files/76086045518.pdf
    • 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_off000100e7.bin
fdc1e3723c95c3bfab428523714709d655b60d43a15f121ccb1fd6b07f83daa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 17080 bytes
font_01_sfnt_off00012d4b.bin
317f4ffd8578136f7cc72ccd57f81e244b545583858fc92f6e239d6d6cedeebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 11188 bytes
font_02_sfnt_off0001473c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1473C 16792 bytes

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