Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b88b2bbdfb8b648…

MALICIOUS

PDF

94.1 KB Created: 2021-07-02 23:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3027b6383cebbddf27c3ab04c3f6679 SHA-1: c33361a3818c858aa90700698c43d563394aca56 SHA-256: 0b88b2bbdfb8b648564f448e42445881dbd92e9e514ba98e8235995857f1a320
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classification and ClamAV, with heuristics indicating it's part of an advance-fee scam. It functions as a link farm, directing users to compromised WordPress sites hosting what appear to be other malicious PDFs. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or social engineering attack, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8b0a6831---24134412890.pdf
    • http://learnazia.com/fck/imagesfile/zaxaxurukekip.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bfc45b68f---40547553368.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd7f6bdcc---91537929632.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074688928cbf---tenezam.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19f72c472---daxujezura.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/763574dbe26caf699d37a6dcd0b04f3f/jonojifefumari.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ce2053d59efce5df89a04fb8ea373f93/92705863826.pdf
    • https://nffcd.org/userfiles/files/zapixerevap.pdf
    • http://jiangsutravel.kr/userfiles/files/20210621_060215.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3808667682dd15654220ada46fd8c98a/91762752634.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a24e55603---60457315512.pdf
    • http://duetsepolno.pl/userfiles/file/lizotijerokadorefateri.pdf
    • http://www.findvoters.com/userfiles/file/norimosekodigisepuzot.pdf
    • http://romanakladatelstvi.cz/userfiles/file/41091595681.pdf
    • http://melly-incendie.fr/img_db/vixebanalowik.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/wodonenexad.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f762cba422---63962759590.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/53192148586.pdf
    • http://lnshiyue.com/userfiles/file/20210527212245_1734373280.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d94f2c167ecb7ed999e58d576ab4b0e7/bitinotilov.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/15fba198a0b869b5c96e77f7b49a9e02/45708371870.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/vh02ncl0dfbhmfnfkdqfac56v4/15710789519.pdf
    • https://muratay.nl/userfiles/file/23015978641.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=journal+for+the+study+of+the+old+testament
    • 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_off000109ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 16792 bytes
font_01_sfnt_off000121c2.bin
2a8d7384854920fc0eeeacc64184f99c927164b3815b582e9448afede553fa75
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 10732 bytes
font_02_sfnt_off00013a4a.bin
a006073a8b2e24a0a8b1f3fa80d5b3301533c0bda7720f6d71514af74c9f7a84
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 18496 bytes