Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71c9d486ee4181d…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 20:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 0f74d25039d7db3451c50668488e14a4 SHA-1: a47e63cae282c59281bafa2aa88a9c102bf75334 SHA-256: b71c9d486ee4181db91cdba1021e9876d43cb0466b519812fd1beefa950419d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=automatic+charge+off', are likely used to redirect users to phishing or malware download sites. The PDF structure and numerous external links suggest a phishing or credential harvesting attempt, consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=automatic+charge+off PDF link annotation
    • https://audreyheselmans.com/_files/file/morifuj.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085067db7b32---60410518744.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/adbade6f33d1460bf5ebb13536d6985e/26121250610.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/27699455630.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ccf923181---bokepasanurilefetibi.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/88775443948.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad60a80a5---moruvikoneputinugakeku.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4f9efe1dc844d83c2ba9308dd83ad506/lebin.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1600f5ae49---xudukisonajuji.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/xuwegagusixu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3863d39b19---diregutapowuwetax.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/61321091714.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965b230bce1---60303612573.pdfPDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ppi33o0pdjabtn99vnc50jvfui/26091168297.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4783599abc3f7e98e8e72b9d2d54d5ff/48273042759.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/57714835690.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/4252440375.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6b8cb349f63260228e884b54b012827d/7250181048.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/zutakuzezekuzila.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/969e14ec867d1c524fc0699e8e88e07f/35006731297.pdfIn PDF document text
    • https://motacademy.it/file/mawitifiv.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb807a684---82354889713.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/07ebb17d88044a72b499d2385db4af3a/vufatuwulipoleziki.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041cf24370---59659486547.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/97364944378.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 17300 bytes
SHA-256: 0436eee4696aed27f3d103c7b6fb7913e85882329eee2884c52b35432d3d9906
font_01_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 10544 bytes
SHA-256: 688a80df4318f9957f2b73837e84fef75b346a6c9c96c410491b22ea832dd70e
font_02_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8C 16232 bytes
SHA-256: 338cc954a946a7fbf70b29c55d5e66db99b2ef151e94d540d22e7b387f44db23

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