Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfb7ee799c4ff99…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 23:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b5b77939849a45cc1ad015243aa5969 SHA-1: 033f1921f60a7449b6ba015300fe376d0978cc2c SHA-256: 8cfb7ee799c4ff99db68cffccfe47a2dc96ed1a97a2cfd6a9af0416b5c1c7393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The presence of 'utm_term' parameters suggests a phishing or SEO poisoning campaign, aiming to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=audio+mp3+cutter+apk PDF link annotation
    • https://konyaalotaksi.com/userfiles/file/lewodipisojonironatoso.pdfIn PDF document text
    • https://quizai.com/uploads/files/77885250018.pdfIn PDF document text
    • http://simoncaulkin.com/images/mopazufajawe.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/23011817232.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/junum.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/vuzadogigigala.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021971156206001.pdfIn PDF document text
    • http://darstin.com/userfiles/files/silipi.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/89780933513.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/30398545766.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/kovenusorudas.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bcdd3fa4---vakojonami.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/kadipedo.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/17569244772.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/68883594168.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210919180140.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/juvevo.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/pigomepos.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166c288a35---90026012174.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/45490438761.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/zekexe.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/reziwurona.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0fd17f5195acb9877ab773a6012b946/rozefitaxuvar.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/73782214872.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142d1543c573---22218660147.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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 17560 bytes
SHA-256: c916883f1805ba4165833869c2f48bcb736f4299e11a4cc87973c05913498b1e
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 10704 bytes
SHA-256: 234086e5f4f59775bccac7522166e9e0f0fa472a892f372bf943759c3ba4c0bb

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