Malicious PDF — malware analysis report

Static analysis result for SHA-256 f621ca033933bc76…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 17:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2396213ff3006036f79d8a3bacb31a09 SHA-1: 87dab115d9e392ad85626e94adfce24fcc855043 SHA-256: f621ca033933bc763adb2fa657be25dbfa4b30b585643f4fd2075fcd3d0e22bb
176 Risk Score

Malware Insights

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

This PDF contains numerous embedded URIs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the presence of 'PDF_URI_IP_LITERAL' suggests direct linking to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://chcial.ru/uplcv?utm_term=torrent+a+quiet+place+2 PDF link annotation
    • http://asacnfservices.com/ckfinder/userfiles/files/kazapuxalo.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/bojalejute.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ktet52f26vh6emvoeo44jsbc6s/61600337652.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/20849175843.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/65510387717.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/dinixov.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109032121403761.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/devisux.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/sikozorojireguv.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03834cf31---ferav.pdfPDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3a257d09---fajozunerop.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/mejomewez.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/12243875222.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/12837198251.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/dovozizevimokoxo.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/pisekopogarekoxegejurewaw.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210901080100_ke4h00.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/dazan.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/zalukusawavonimarigiwen.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461858836---30179368631.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb7860dbd---60714897857.pdfIn PDF document text
    • http://mqskin.com/luutru/files/70005566975.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/tetoxirixixogimewufeleb.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210912033100_MTE3Mjg2NzUyOTE=.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000b6fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB6FA 18224 bytes
SHA-256: 21108830f7198d5f727a323d84b0e0d6d92371f11c84bcc830658cc4678cb276
font_01_sfnt_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 16000 bytes
SHA-256: 5e9080e64ae5b7c53a0f792a81a54b5c2f176646276fc81c455c41de1fe63e35
font_02_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 10528 bytes
SHA-256: 1f6d130269a64d5d73a863abf0dc962c5d10291d60eb497a869396dd08cf9e75

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