Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcabdc74bdf5c497…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 09:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3a83da9518111554899a4ac6e19f41ed SHA-1: 0dfbb4454fd285ad657f401326cf07c430db0bc9 SHA-256: fcabdc74bdf5c4979abe07dc102aa196d12602f0fdfbebf516edfebbed428b49
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate a coordinated effort to attract traffic and potentially trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://atrax.hr/files/kuxufepar.pdf In PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/217f74a6542b45bd482ffe801ced36ab/dagazikenevobojejinokese.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090a34698dc1---pazepugusefarigaxak.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e1bd2d29---15038194233.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c7e6c06c---xuniw.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/d2ef867eb23cefa14334c2f34319c3ef/merunol.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1g0n0b91tr5r5sn3bir1nm2cm3/linabawudo.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/zamawiri.pdfIn PDF document text
    • http://wohingltd.com/userfiles/25800544988.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/a9bb6e92a7b1d390b8b23c23fa7d2ba8/96552041796.pdfIn PDF document text
    • https://netlandschool.cl/files/lidokelovakirofazozeluv.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/45124c5a8de09897d5249c07d9494b94/fumarewufuzibadovusazes.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/fe5fd3a5aa105833005bf318f96295fc/dejewozipuxexufuvosigumol.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/kusakesaradopamimo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f273904d27---fitogena.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s6viag2tqh77nhq212sodthak0/90743464850.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c063b93495---rilusamos.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079a88094383---93250497816.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/64042d2a6dd37ff28bbeab2e777a24cc/xudixatakapamu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5346ee000---82588144575.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c17e1863cbd9110c13e47b4ae15a6a07/lebuxadonifafazetulabig.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608235a1a4747---88278966095.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc5468ec0---36011922965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+z+kakarot+ppsspp+download+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10816 bytes
SHA-256: f5f755c47fe373ac6a4f059fabe8a20bbc7944e67c19b7d63b8e8b8fb18caf61
font_02_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 2652 bytes
SHA-256: fbf7645643bd508aac54093ee4901c11012babb518e86c513ee69f89cb264201
font_03_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 17400 bytes
SHA-256: 04a37165ee85eba5db3b639a8df711f6dcd7bcc417d141d2c55deeeab06f0477

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