Malicious PDF — malware analysis report

Static analysis result for SHA-256 10209d075f3545e8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 12:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ef12e3ffda1bbebc4af5e4122860d52 SHA-1: 7b87055430650b629c25b6196386680ce8775b0e SHA-256: 10209d075f3545e812f89f15b51cbd2f0440b179fbac6ac14f1bc3dcdb9a5241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to link farms on compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://khlongtoei-nfe.com/library/userfiles/file/bigasigikotosamowotozexa.pdf In PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/75504942897.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/6153653355.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210907_145342.pdfIn PDF document text
    • http://bscartridge.com/pic/6884814769.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/sositasin.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/gexujunevomaniduvatinozi.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109111724325139.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dofokidojetixik.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/90298166799.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/24506214775.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/74623299469.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/totisifujixanizu.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/sugumuwiberivik.pdfIn PDF document text
    • http://net-marketing.hu/images/files/zofot.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65004013195.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/gikokodojaneveralababagux.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/mirejivufikemigaxujixag.pdfIn PDF document text
    • http://gibisch.com/files/files/xalegatexe.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3455d737f---jivonolu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c3211ef4---70507359883.pdfIn PDF document text
    • https://rais.bg/uploads/file/5311722551.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/85218020029.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/erveagkrenmq1qokp0jscrpa84/wezataxivufuvov.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/xexasuburulogefolumoforov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=crop+song+for+ringtone+androidPDF link annotation
    • 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 17504 bytes
SHA-256: f7c080557125f38673b26d10507b5af4cecf45dc44769591e903a74ef1970388
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 10656 bytes
SHA-256: 8f72e5c53f0100adedcc7f3f94783f037aa4d9b57b076dcd788d29d1cce5ef59
font_02_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1