Malicious PDF — malware analysis report

Static analysis result for SHA-256 274a50dbc1323456…

MALICIOUS

PDF

82.3 KB Created: 2021-07-02 05:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 674b5189509ecf625ba3a90459d78aa5 SHA-1: 2a65f8ed236f6280728d5c011250b47f64b3fa4e SHA-256: 274a50dbc1323456a157f50010d0ee386c1bcd19ac57fc2304975bc22e65af3c
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 high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is intended to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=need+for+speed+most+wanted+manual
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c374f7cc---dorasa.pdf
    • http://ibb-online.ru/f/file/11950115343.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/tn1d1aovfe74hs8sdgg63ojrb7/18328260938.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/nhp1t8sgdgf5dnekma1v0qb9m6/27794608318.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd96a0e93---ratekulovivuwaruzomejere.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5hn9h4orhht9o1g3pvjcp15j5a/95634851690.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd50f42e10---suwot.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9242ae3db080429b2a4b0bf7f6f5e391/xakuzebizadeguta.pdf
    • https://prtl.pl/userfiles/file/nenujiwotaje.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/fifobigepuvila.pdf
    • http://mim2010.ru/userfiles/file/72150171985.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/zetevezeweligolefewaruzap.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607850f5a3cdf---16384732731.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c096742b25929e783f2b8e0d03325fd6/10033340735.pdf
    • http://efuegypt.org/userfiles/file/vakofupexaliwigewuwemoti.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c8cd1d6021e7a952329dcacb4b45c681/busomiti.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609829efa4364---bafujure.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609743f6c89e3---vomoru.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160757c93ecb1d---sijazara.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9dc31093---45587669109.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7s6j216tvtpd8nrdj83g1ok9h1/50166614353.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/8044789661.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/gakitubegexi.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/zetuderexeb.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_off0000dd30.bin
326f6119d77287c72c433a92f9a1b3c53b17efc6f9300fb5c79ace2146f33aed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 10728 bytes
font_01_sfnt_off0000f5ec.bin
0c560e1b4a7593b55a6f6aa727074aa993a8f64645c140309ddb6ac4c36fe4a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 17836 bytes
font_02_sfnt_off000123f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 16792 bytes