Malicious PDF — malware analysis report

Static analysis result for SHA-256 8963afd8b5cf3f75…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 15:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aac87f6660b74ae99770a8eef1aa4e67 SHA-1: 24a49deb3819824a16721d143573ee31f6be9973 SHA-256: 8963afd8b5cf3f75f877a0c1c1e58728c869bbf264df30cdcccb353b2dfe87e4
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The file's structure and embedded URIs indicate it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d2c9653105be7730bd2da7425e58fe04/rizexufuzavupufexipaverag.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5a7d58982b8f0381065362ef92825ef6/veros.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/14019019162.pdfPDF link annotation
    • https://hosvagyok.hu/userfiles/file/mabigujilamemobasape.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/gigedugozudunanada.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/7921454309.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/pufig.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/se86tmpd91nukd0rff0s2cgs8h/91948241624.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/vapoxuluzegij.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/21984271464.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/xuvavupasemumatomekupe.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/64355764158.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/zabanizu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/mijevubix.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/gapije.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/66048474913.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/682542bc9a08926cba755f54840ff4c7/nebimev.pdfIn PDF document text
    • http://elitvorota.ru/f/file/vekux.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5p0h727qvl2v6f2vj49eegkcf/sosufuvusoragavarokema.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/89598575790.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8b680c03769cb74ef6bb80572e400edc/bizimagunav.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a31a137670---fivukuvarefitumuzubet.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117a28c92baa---57259607160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=o+que+%C3%A9+pesquisa+qualitativa+e+quantitativa+pdfPDF 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_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 20136 bytes
SHA-256: c70c0d6cc206af8b3e97553e4b4f2631e7db3a3d0cb76eb596a25c3359f73c67
font_02_sfnt_off00013b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B27 10760 bytes
SHA-256: 3ba9d77bc33147fc98bb4a3b8d6267ba7245389dd7a249047ce9814418e6c32b

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