Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fe45e0b595707b…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 06:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15b670b5d50e625b028226b6ce433301 SHA-1: ffa53ce208fe1ece931f4d7694a38541564f1a1f SHA-256: f8fe45e0b595707b5453872cc61f1841d80cdf157801426c6066ee834f5fe0e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of disposable hosting and compromised CMS uploads for hosting malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=what+are+the+differences+between+catholicism+and+lutheranism PDF link annotation
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853a4bccf16---29915294446.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/29736103045.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t73et5jc84ab8kuq9oq0rhaou7/rokono.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/28958275106.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/22178077365.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/76855553259.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc7f855ec---rebobemu.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/rimowevepipoj.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e829931a93241af9b46d36b9457263e0/5896986608.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/webanafajigaboziziloralo.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/f0oml53k4uid1ntlbarhdb2uiu/biritupiluxavukudovev.pdfIn PDF document text
    • https://ntc-container.com/upload/files/lexeruluzesudus.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160787e294f68f---zuremokaxeferope.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/nudenijiroximuj.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/taxadatanovimujo.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/8739402435.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-13/20210513174436101296.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/92743816833.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54a166251---radepavujesepotowo.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/98228870269.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/lisomawobedope.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860175d5b92---ludavimedigorupu.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/babomuravepa.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/lovoto.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_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 11060 bytes
SHA-256: b6b8e952f6fa171bb31a87d7d016b14c4d5b6b7f1d100b3bf3bf3b7727757abf
font_02_sfnt_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 17080 bytes
SHA-256: 94c498a1cd34cbb2667dcc3005987920c41d7f669beeb8f150fa4d19f86ad1d4

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