Malicious PDF — malware analysis report

Static analysis result for SHA-256 935a1d970d8e3334…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 06:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17bb712357d9b62ab4ce84a60b99d144 SHA-1: 1175806fdbef935a000419c524b0b7dc2d0e9d49 SHA-256: 935a1d970d8e3334135332a4b71e7f6bff1a9a1b0fd332c90477a50cff7eb4c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://speakingaboutnetworking.com/ckfinder/userfiles/files/46387488164.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036a0a73dd1---fopegosirebu.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160da58b2ba430---pejisexobumumufonal.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/10878325778.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce9a3d09b---bugizilulitasari.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384b8c5b10---96557742580.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dewulivunarazuzuguv.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/72454918274.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202108271856309194.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jewil.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/saruvakiwulafa.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e70a6c9f57899c35c34b0c5787da6bfd/wuwojemupabowirawubiz.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d360e42cb2---logevugufuleg.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/firudafejepasusaxuvoso.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3936425d6bc7c8979e3c0feba183be70/4009727471.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/91499755744.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6f244522e5dc10b72c255b6ae02316ef/woxazalidogokaxokezoj.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/12437098177.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4a5440ed---nefejorigovisireferut.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/rokijatusofekuj.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/fivixoreziferidupuxe.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vm6llmrft94mdhdt4vt446jgt2/zubuwamegokatedoje.pdfIn PDF document text
    • https://irantruck.ir/data/file/31556812829.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a38da6ff4efc054e146f9a653042cd19/tejoloronipepuradidopakov.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb0f6b13b8---zunoxijezezezi.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/gimujetunorererenaru.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb57f1682---86567643666.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/24509011058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=number+test+reasoning+questions+pdfPDF 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_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16740 bytes
SHA-256: c2ceba5dec7ae9511b1dbc0a0ed7b4398a609645719a15480176d19e72dea8c2
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 11156 bytes
SHA-256: 2b1d40cff57beebe50843db14a3c5445299ced57d6205fb137824aef79eb1c67

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