Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d842f16dce63eb…

MALICIOUS

PDF

75.7 KB Created: 2021-09-22 19:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81c138802b837c19208917546dea97d7 SHA-1: 422bed2953e1f7d41e3eae36fedcfd7289cd3b7c SHA-256: 64d842f16dce63ebb3612f8d9cdea7fa4274040661317acf719d52cd3d3bd3ec
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's purpose is to distribute traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://merwepizza.com/upload/file/6343979749.pdf In PDF document text
    • http://esrafisek.com/images_upload/files/88474697000.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/sisigadewonoveboviw.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/xunezevuwatajakamejomira.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/60491114645.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7hhbu7kdf87su23gjj7ggip49c/66074318453.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/gufiwevizodivel.pdfIn PDF document text
    • https://digireg.nz/upload/ninomawonoxovegigalin.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cea5c29bd---zumomegipi.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/sijuduvitativarifidew.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/wiworimefodagidugowuveje.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2g7bicd48nf5fnq5s05lfbr0bg/68612719838.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/mikekafoje.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/94350538584.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/77822828870.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210922141953.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/48939053180.pdfIn PDF document text
    • http://www.celso.org/download/74825728541.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/lepadunawemurib.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/58432111427.pdfIn PDF document text
    • http://dfanchem.com/upload/files/fusufugilakefik.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/15436292313.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/memunaril.pdfIn PDF document text
    • http://hanifeugur.com/image/files/85852813338.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/pulamekeduzok.pdfIn PDF document text
    • http://slsnn.ru/content/file/55040089230.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/vakexuvakilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+server+with+bad+anticheatPDF 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_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 10692 bytes
SHA-256: acb6e14825a7401f961cf3367bcda960ca9d4277a5ad5348a13edbe80dc5e199
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 17180 bytes
SHA-256: c8909f03814480ba5f3f12aabf6534f234717ad355990c6fd869a8adf3022c9c