Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a24e239732ea98…

MALICIOUS

PDF

72.3 KB Created: 2021-09-10 11:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb931ddc31360158748a38439999d0b3 SHA-1: 6077038f876f865af39b100c243bae92470fa346 SHA-256: 68a24e239732ea9831b02b9ed3287876578fbd8b8e314ceac503bb64c0d16e60
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bularz-auto.pl/images/userfiles/file/fabuguwojumonozevogobuv.pdf In PDF document text
    • https://sona3elkhair.com/userfiles/file/21054250950.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/visariditoxogivutebuneve.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/43261999357.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/wigona.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ad1ce9e5---39264399602.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/95538606018.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/88612817067.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/muzizonaludig.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/goforelo.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/sutegexadukobusog.pdfIn PDF document text
    • https://mcsfood.com/images/file/79329527759.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kezodamuropi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da4d0aa4b---25268417060.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/tamexole.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/lopadajodebimakowajiv.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfea9af07---9090765265.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/33889413361.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fa9bfd1c---72264737444.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/81287175747.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/16347229074.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/tegavunen.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630748784/file/86252357962.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/69553245669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=december+malayalam+mp3+song+downloadPDF 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_off0000b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 11180 bytes
SHA-256: 3c8744106d7128ba291cd5be7c6b2cc1409f04eff9124f3bc8d2fa5ef1b79a34
font_01_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 16892 bytes
SHA-256: 67b58936ec42141ef1f0da10f196479ffa8d827352e2af6161a8f7ee008a26c1
font_02_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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