Malicious PDF — malware analysis report

Static analysis result for SHA-256 3501d9ddea4b0b76…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 21:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c25c566e862abd96ac9e026e58b01f7b SHA-1: 120cc751d0375e567af459510fea36655986d4c4 SHA-256: 3501d9ddea4b0b76e3e5b4f7e0b848e07360f9560a6993ee639ca95d875426b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=beginners+guitar+lessons+the+essential+guide+pdf PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8555462c80---jazudulawiramifa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915eded6d48---68837511393.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/30667555244.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/154fef29537301aef891ce22a41ba9e5/838966538.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/74170839950.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052503145463.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/cp38n39k0le4960r9kn8m9jmi8/70678068772.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/relenurave.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/055728a91c550dd06f6cd4eff40f1acf/39529097585.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/78863033528.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/filiporakigaxepasimesu.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7469332c---17003604035.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/maxajad.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612160177ef97---vawizoxogebo.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/lubomupadoz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a293493fa591fd6da3a745cb9d5da479/53585937474.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/pijokaxolenojuwa.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/43137473508.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tegedujitogebozekibulurar.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/95672772674.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/fcfc0841d2f8bc8fab9e1a45a7d23978/36249467845.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/mewuruzelifa.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dufuwusesewe.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a6a33r684acmap3fg77hphn6r2/3196065219.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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10932 bytes
SHA-256: 047443ee0e8492912a9f268f27b027ce5d8bff762bc5b5632fb603171b0d6208
font_02_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 17832 bytes
SHA-256: 9b0d38cd7436cace37b982a74b68688428e42ba6eb6a14ad84bed24463770ddb

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