Malicious PDF — malware analysis report

Static analysis result for SHA-256 abca685a9ef40f94…

MALICIOUS

PDF

86.8 KB Created: 2021-07-13 08:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b34e190491451efd359d2bd69b1608b4 SHA-1: 9e22a0425a32e072746960004961984be34da234 SHA-256: abca685a9ef40f9409780b3ba01300d2d40655e81ad43769a8dc05b6e48a4460
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. ClamAV detection and ML classification confirm its malicious nature. The embedded URLs and the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ac4aa21e3---xifusanitisobafuduxibud.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1cfl08ihln1aeok46lpb1amret/86231355110.pdfIn PDF document text
    • https://italvaping.com/file/dirux.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f30ae743fd---fofuzuxumomufaxetufo.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/61868077457.pdfIn PDF document text
    • https://orrizon.ru/images/file/jusamaridowomuza.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/vadafomulepupojuzibufix.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e81fd82b1abe711abdb5818953ef6bce/35544251883.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0e912ad5---xiregoberides.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/pilubebujuzovajerunapuwe.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/96772937716.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/42a656d04851bfc788c9701c4b303bd2/zewelolol.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/bezadaziwaloruwopizukem.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/iaopl5vt86cku26e8gg3rpt9tt/67857851535.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7127a94b2aae41ee7af543c8d6f2ed42/folax.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/fujizepolivavogil.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/libejagasonifafaramopibiw.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/muxifafeto.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a4e753596---96977696608.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/zadusikiligefop.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb749c28d---7068599122.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/jasunorogusotoja.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/92827124671.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/xepijebivilumujebar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+breed+skipplesPDF 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_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 16844 bytes
SHA-256: d3824c78d0db4a0e20abe2c3221b19cb1313ef2ad62922beede13324839ad0fd
font_01_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 10428 bytes
SHA-256: a93929496160762f914524c988beb6717a0df23584367c8f3cc8f9e1f12caabd
font_02_sfnt_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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