Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c1c2607915cf6d…

MALICIOUS

PDF

93.3 KB Created: 2021-09-01 00:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9909e2232289ddcdaa284f817bedc6d5 SHA-1: 2e107d5d39b0635c3eb5290d2528d6e094f3fccf SHA-256: 42c1c2607915cf6d0a4554e4170f265c8ae9f2e522d19956e3a8468fbc3eb4a5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection confirms this sample is recognized as malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=exponents+and+powers+class+8+questions+with+answers PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b188f94f90---73599837242.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/45449328763.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/legoraxofupuz.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/34292767640.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/52296515656.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908823e0159---dogezapi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fd34581e---wovitatuzaxisupiwutuw.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/luvadibujibivuxurowa.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/nopebonujefapobula.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/mirugafoganeguwuno.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/vetewewatav.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd837743da---32598595684.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/40309329201.pdfIn PDF document text
    • http://rivucota.com/upload/files/tukenokisimutopoj.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xepazizefidodubug.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608434fa8268d---laxiluwaxuvalabelabo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/82023201738.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210810092811.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/74451faa0661c10e62bf2f85acf7cc4b/9961653432.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987edb8c513---3081819677.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/52356287941.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jov9d38v9iq3n1fpraainecr9u/fowowebadizofutibuwaxam.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/nariduvalosexazisafi.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/67330780488.pdfIn PDF document text
    • http://termocity.by/pics/files/88510943487.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_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 11236 bytes
SHA-256: a9d48f36eae5a4067434394de2b0ccd52f42c2497b178a8e8c7952e074b62c90
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 21860 bytes
SHA-256: 20df20e33917f70bf57caaba733702cf2a6cd8ec5202930f1f7bcadad42187fc
font_02_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 16348 bytes
SHA-256: 8fcced7a8fcbf22d45689b44407ce1c1b45b78050135da208b7eeea4fc129b0d
font_03_sfnt_off00014dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1