Malicious PDF — malware analysis report

Static analysis result for SHA-256 d246dd806a1a4beb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 16:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8009f357b17fea3078988698163d4bd0 SHA-1: a678bb09bb2c9f3bdf2ea0999f0a521551d9591f SHA-256: d246dd806a1a4beb4ed51180830ffc748232e4e842cd737972aa42080da0bc28
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to multiple compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely leveraging a PDF exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/lemafemubaxoregeribojolo.pdf In PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/40799614507.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/42487593951.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/94150821397.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/epb183b20q6rmfgmknafd9a6a1/mipezutiso.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a6d5cc55---veruloresemalaxu.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/gamikovukebo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/t016pugmecnl1vskmatnhj8q6p/62118945290.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/76473966929.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/59ec3841fcbdec6956ff8f09290f77a4/28302899643.pdfIn PDF document text
    • http://kientrucqhouse.com/uploads/image/files/pawukigekefetutez.pdfIn PDF document text
    • https://aksusu.com/upload/files/puwadafa.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae3e98e19---nepoluwobefaviwi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/lln0lqjv4c8d63c98cmfiu6e86/44425482596.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798027941d6---93997595560.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/93127248728.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b6c63770d06aeaeaf40fb8cfe6336e62/30049366914.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cf30d0db---mijujugezevilifadiwun.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a002f49b890---tedamibunagutoxi.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/82201550180.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/marejivodoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=convert+pdf+ke+excel+paling+bagusPDF 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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 11328 bytes
SHA-256: 0217afb886853c42db44795ade1260d3bca253cf8282b80fdb8299b1b8e33f43
font_02_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 18188 bytes
SHA-256: b6d99efe609a3fe31651b8de35a0efbddbc43e12f63a9b3e4d1f04d72c657226

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