Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63dc0c81941be36…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 19:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e2139d4169ea6d6d2ae767c925e53c14 SHA-1: 3a2831a6843964ccc8e64f048728d8f4c06d2fcf SHA-256: a63dc0c81941be3692675b09928ab915255de103568a9b320fbd90981b68ced3
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=a+modest+proposal+guided+reading+questions+answers PDF link annotation
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c99d92d26a7613752c73c23ee2b4a11d/55155100835.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/99541312237.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/80865110890.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/rokefawutenojukifawez.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607722131fd54---56539331602.pdfIn PDF document text
    • https://atl-50.com/files/file/bezatusodupabejebupovaxad.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a7fd490fd43b5a7e16ede4d06f707c84/giwavovefotu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/rapamasimetuw.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/banom.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2308a1877a---gadawawox.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/funosiwuneputex.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/makitiwobatagepagu.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/pulozijagefudabare.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/xomezuvipakedopesaduwux.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/xaput.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/bufuroxapimibewagalidin.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/dokemo.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/gomesirosejuvifirolomoto.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b2e001e7---xekezus.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a745b1e00d252490a3811ead51c3f3ab/60352664937.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/18790170684.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/68437183704.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/70179436543.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27430dde5---tazafuvakutarodo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ccff2d629651b3dd4182b64cf9d46d3e/kizivobijun.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/57751215764.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 11048 bytes
SHA-256: f71310fc6a2e23311aad96f11977d17445fd5d5d681215941048a71f376a8264
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752