Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8091bda00c0d945…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 23:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ceefbf8824cc0fd6703253059eb4cf64 SHA-1: aa0c66500412dc04f9a61e26f223182e7ee8a4e8 SHA-256: a8091bda00c0d945576e8f259bf6c9cf80b50fb6c8f1f2eff9616dad26f6eada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=research+methodology+by+ranjit+kumar+pdf PDF link annotation
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/govazapudunumalegonisirin.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/57682979206.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/xuxulinofo.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/944aec7066b29a601348edf98196a180/90484468423.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5c4720d6---15382913740.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/fd0bf98ea03ed64de5256d83c5a4e34b/54170788785.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/malijuxejilibuvarowun.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k0mob94f8tb6unoql27895qptl/kabanuribaxuvusopufum.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1016ebc4---xigizig.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fcc703281---tovuwanizedozel.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c365c321c38---pepiduviwejoxo.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/92ef9e075aad0f177b238e920df85dab/semabikoriwarebitiwobik.pdfIn PDF document text
    • https://badrivishal.com/media/17721134298.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/24050221482.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2fb5e645a---rogunavokanilegi.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/woleposiro.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/wuwigixulematefux.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/597kqspuihq6fdhmg7bm1dpnfi/fezazofejewagi.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/difazironibenijobunase.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/tadipukekom.pdfIn PDF document text
    • http://blueyee.com/upload/file/141046245882.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78066df837---bolatexuwetosat.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9675ed6ede---todebelanunurilujadakeluz.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/72676943799.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://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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 17636 bytes
SHA-256: a1f965d1336efedb120990a13a1bf864b84ceeb82698b9ecbc5bc5bfa1abb82e
font_01_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 11688 bytes
SHA-256: 7878ae2b3d0b812cdb93eb518600205ce0d2c070d4e4c48c82c6d3cb5702c4d4

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