Malicious PDF — malware analysis report

Static analysis result for SHA-256 31549710278e314e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 10:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae0def2cfb0344cad506fca8194c4204 SHA-1: 8948e0e12229552ff9e5cef943b9c92a7f90e34b SHA-256: 31549710278e314ec74ba0589ea1e21e5b5a60e6d738144373f0b5f8f146fe80
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=among+us+hack+free+ios PDF link annotation
    • http://harnettcountyhba.com/userfiles/file/lasuzesefulite.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a2f57578---tetafikovewala.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161369d90be8af---20861773568.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/xepomepuwazugumum.pdfIn PDF document text
    • https://samowar.ch/upload/file/95266431895.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/53902977882.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5j7ns596tbs6jih3u5si9qoppm/34499189765.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/72395189384.pdfIn PDF document text
    • http://partnercable.hu/files/68422018263.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tezebiwakoniladu.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/ronapusuzorewutof.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/12070095655.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/gewin.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/43086665014.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/67507354826.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/83999589508.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/63695020645.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/29991580565.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/21905299870.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zebisuve.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/kovuvomut.pdfIn PDF document text
    • https://uudanbury.life/files/file/getoped.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/13107964500.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_off0000b25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 10812 bytes
SHA-256: b939895f4e4ea4429e1800bae733b111eb30c9f6ac06b9370ed0719a3101caa0
font_02_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 14996 bytes
SHA-256: 5a8935490919aeb951842b7ff2f8324f8c3eb9c71e1fa009754abd2b237a3019

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