Malicious PDF — malware analysis report

Static analysis result for SHA-256 943e14612672130e…

MALICIOUS

PDF

100.4 KB Created: 2021-08-21 09:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9e7194fac9bd3697e880bb5f65464b9 SHA-1: c822e7848a59a169b2f6057e299c2313e8c01e39 SHA-256: 943e14612672130e12799b2d2cf3eb289bec7a76d488a8142fcf332e289ecae0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=como+calcular+valor+de+aluguel+de+m%C3%A1quinas PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31272efa17---35890082225.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/bemotonunimazedivumod.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161173646f3392---38200607879.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aff091900---luzemaf.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/299f7b807ee319756c5ab52de5a754fe/zusepetumixusatikir.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/11936595201.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/43026190647.pdfIn PDF document text
    • https://aashianarealty.com/file/98044846346.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ac0b4cde6b750e67d4eeb398e3cc3442/xafibofitopom.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/bugozalagudefadiju.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/565730c5349b2ad8dca3590e314bb84b/74833207039.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/12618706676.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/23679236074.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/rejolifabijedo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16073926728757---13571763393.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210803101902_lx1tf9.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160914c7153080---nokunafojuxopalimejupef.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cefbbb7726c---82605350484.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4df035470e3bd621b74d0c01183addb8/pafakuzuvefosoxufuz.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xojasaxogovoda.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/seborowepubez.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/73409864944.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d8185a4131a---mofapasidolis.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_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 11136 bytes
SHA-256: 0df22f833877968a9946c415897da01bae2226162465520680482e97e52cbdb1
font_01_sfnt_off000138df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DF 19768 bytes
SHA-256: 848f8a7a8946a639dcccd262daed4590c3e562013570ab5e2dd44647bcff655d
font_02_sfnt_off0001695a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1695A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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