Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9adbcde22e590f7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 03:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94fec394e95c97e9c1016efd0cb85c69 SHA-1: 77921a2734928f557883a8d99196b357a0c52d2e SHA-256: d9adbcde22e590f75a0b8bbb63030ebfc04cc2a00daaa2979fbf4d1b952778e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, suggesting an attempt to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=amtrak+southwest+chief+schedule+pdf PDF link annotation
    • http://cdhsalumni.com/clients/28864/File/zuvafumaxixupujewaxuj.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/28409725483.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856d2e897c4---12257566989.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607934f930db3---67350682847.pdfIn PDF document text
    • https://peterdegendt.be/file/70165975045.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/85926421980.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/81012393231.pdfIn PDF document text
    • http://serting.eu/userfiles/files/67939401993.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/52199100727.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/370200438abdd32b7b15a6552ea23a76/rudilogilafox.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/70245430496.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/luxanusesowerepamivukijan.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/rnum59nkml6gtuap66p4lp9ruc/biguj.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/16374463339.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/17244642309.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/78376056825.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611382f1625b3---fejiwiperiwekodemi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/l9vpljpsuisobcdeq69fajhjm2/nudawepiliwinuwuvax.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/54092645191.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3528c3fb84---62534253821.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/89841506987.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/xogenuvunirodinani.pdfIn PDF document text
    • http://biomehl.com/images/content/files/domapibemulev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 18324 bytes
SHA-256: 46e62a72a7d507f5a5708ac2ce746353fa1157f5eaecdae1bd2e61c17fde7380
font_01_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 11040 bytes
SHA-256: 3423600fa49ef68c4310b9c74b8d7b174cd089ed4cd9d47bd15871aecae8e3f9

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