Malicious PDF — malware analysis report

Static analysis result for SHA-256 27040d1ad669f5be…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 15:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89c2d13785de5154b7d1cb050ca6c9ca SHA-1: 1b7ea302d6d975aa313b9a37096a69c172476745 SHA-256: 27040d1ad669f5be58fa9d639c6524303909a549bf08ce4f727de722c5a8c5ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/299d87d9599a0cf097b9cdd9ef2ade43/30423604935.pdf In PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/63583195607.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a95246e7bc32582a5015007f9ccb8c74/zozabalawogujil.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7054545914---subewemedadijofirorol.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f46b27cfb729a85841720ea56b9f6695/58825042701.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/bobakevibebipejuludumogur.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/fisotujopigox.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/28efe954bc9eb530947221a503622f59/zifagoguvuz.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/43847986255.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/butok.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/22o8jij20g0n16lsumkjf1tgo2/4507732517.pdfIn PDF document text
    • http://elitvorota.ru/f/file/53016862599.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a332b3cc8c98a4e1ad2669ab1b8d49e8/19940352844.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/degavusakupomu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9f0f972db---xipefu.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/7282300987.pdfIn PDF document text
    • http://labonscafe.com/userfiles/54809240415.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/jijixadevela.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf10be086---rujaz.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/75055836085.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/zakameniwexafipol.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/23f3c74babfe1bfe6a2eac6f49bc31c4/17080352468.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/nivuve.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/045c8b5d3491e5623af8841551bf7318/68591646935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=reduce+size+pdf+adobe+proPDF 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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10712 bytes
SHA-256: fcad78851d45d5fb882f8659ed350a83185f7f26662ef47e9fcb05da67494b4b
font_02_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 17168 bytes
SHA-256: 37af8486229caea9dbd3c5677ab793f65c41012bf08775c34e2ad9bed1ef62a0

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