Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1cf31aabbea440…

MALICIOUS

PDF

82.0 KB Created: 2021-10-09 00:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4782671b32f14f395c4c8bffcc594281 SHA-1: 5023d5fb5e7d07938b655cefbea52e85b865f795 SHA-256: 6b1cf31aabbea440b5f042452f71ff9ca9d4a00f880e9dc27f762be6b68bbed9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and URL distribution align with techniques used for initial access via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ocean-ex.com/images/blog/file/73997531894.pdf In PDF document text
    • http://kvbm.org/pds/userfiles/files/9480049248.pdfIn PDF document text
    • http://moristas.com/userfiles/files/29850851066.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6dc53f16c162b9d081dba332c3563c71/24270588261.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109120123386054.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/10439015604.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161567469c7af4---27290015200.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/sasipugetepu.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/65977077865.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/wisozutifipavuzezodixe.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/69077885068.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/wadobu.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/tosanikikipabifowazo.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-23-24-30-36.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/79161213419.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/18526868836.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/gisarukiwijawu.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109270620089662.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614231a3b1588---35135524449.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/sagokizatevibeweno.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/bajajefojovesofoxepar.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/56957891097.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/40665227894.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/78198314343.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/maxufajedifotenefefuxo.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/052050361245.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/wadus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=map+the+expansePDF 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10084 bytes
SHA-256: 1cdf35975edb96a14ae4f5614c4ed02cff4b68c30f08c62a2ceb11744c457d49
font_02_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 18568 bytes
SHA-256: 15563682aa41f5e09cb0ae059dd4b1da9fd0c4817558f9699fd7d855ecaf311b

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