Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfd234bc0e882c5…

MALICIOUS

PDF

93.4 KB Created: 2021-07-05 02:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 593bfe3e7e220c386a08cf5fb597b9e4 SHA-1: f603b3f6cb8c8196cdab2a7f125ee9897f0a1411 SHA-256: fbfd234bc0e882c5183a9dd7aeae2b712e090e4c50b2e56ff5115cc7c4935cb5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised CMS uploads strongly indicates a phishing or malware distribution attempt.

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://ketchas.ru/uplcv?utm_term=words+about+taste PDF link annotation
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/etcplu30lukt63qrk159pap5t7/35879712992.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/6390f019490ec0e9834fcc4a690c6222/nukefigis.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/rapabilapaxositerupelepov.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/bagiputoviferibosave.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v003270p5h1u6eb225hoqa74d7/32332431354.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/betopewifegideb.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a43e9716b7fdd0c982e9b87b0da07ee4/koranodulawuxonozewapoka.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/98291f9c50764b2baff3dee0c28067fb/kalegiga.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a161bf88b01---38587709731.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/93402481653.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1bb65617f1094629d74558c1f33ba674/6754153222.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/88448779571.pdfIn PDF document text
    • http://biomisszio.hu/tmp/gapawop.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be872e550df---rekuvivimusiturupiji.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cf55d1eb7c3dead2646c55a3900292d/44061314955.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c27964fe1---95080754058.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/497385a6cfb127bab8b407148c0c910a/bixubisuxifakezularogaw.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/99151402679.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4c62beb3418428a196cb15fd384f049f/86171955915.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/cjusjdokn4hn8ffolbdlaja97r/wofulinaxijuravos.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd037dac3---sobijoladibisi.pdfIn PDF document text
    • 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_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 17508 bytes
SHA-256: 651761e011ab2e5916e846d192b17cbcea9a872a3a16a30a68a79ebc6cf55430
font_01_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 17208 bytes
SHA-256: 6860f7051ef696535ea92a653bcea1475e5e0f97e389e746d8f090580fe3a3e4
font_02_sfnt_off000137ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AE 10232 bytes
SHA-256: 43ea99cedc10032c13d0d46e3de13fcae23a64c06fec675bd2406233acac91e2
font_03_sfnt_off00014ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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