Malicious PDF — malware analysis report

Static analysis result for SHA-256 b891e784d9cd4ab1…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 00:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03d22ac58897c1d146dc4448b5a277dc SHA-1: 8bd7931581c39e36f62cea7dd320bbf6ced46949 SHA-256: b891e784d9cd4ab1145f843b2a3c23eb0ea7eb206de32ce87196de927642eaac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites and potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious second-stage resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9971a7874---muxipilekonepurojebemab.pdf
    • http://makinsushi.com/uploads/files/pefovafubewib.pdf
    • http://ctkupavna.ru/upload/file/41364283698.pdf
    • http://blevy.com/ckfinder/userfiles/files/jomopatibaxasonezaloxav.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609138ad5ed07---tokumawubu.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/b2gblgl19he79ur7s9ncsv8g7b/40330748434.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc41fa540e---bulewugu.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3a4e4a39---tapudozadimobusupuf.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/33438063198.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf15869cf3760a73547a6d1be567a93d/42341432249.pdf
    • https://universal4shipping.net/userfiles/file/kutobe.pdf
    • https://hotel-la-licorne.fr/userfiles/file/bimesubibebilejejegaxorek.pdf
    • https://clubsportedinburgh.org/userfiles/files/xosoxijewupafojilinovuk.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sd07up7ii79ub6hri58g3tr4ef/xonugiketakizaredelugisix.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/2v29hrp069i4dplddcucvbuca0/67180596199.pdf
    • https://csp-pub.com/stockages/files/rowifixobawanudok.pdf
    • http://cesishotel.com/res/wysiwyg/file/77914711242.pdf
    • http://thermogroup.ru/uploads/files/duvox.pdf
    • http://gazosilikatnn.ru/uploads/files/86117785836.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/06868bb15f731ac13aa74d98fa298c4f/20755079505.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed8dd6a94---vawogadof.pdf
    • https://luminex.pl/upload/file/vavawazikixap.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a01bc848810---bevovibas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=waht+is+chemistry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 16792 bytes
font_01_sfnt_off0001050a.bin
b0cf529ffe7bef2aa58607f65ff5bf5341a91dabcda472e9019a9378caab915c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 16640 bytes
font_02_sfnt_off0001306e.bin
6f59515cde839a4e5b93327be970cffdbbcd83d25f9390810fd50a5eab61487d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 10332 bytes