Malicious PDF — malware analysis report

Static analysis result for SHA-256 3990ace7060105cc…

MALICIOUS

PDF

89.8 KB Created: 2021-06-26 04:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da357dc3f1571d37bd83c35fd6c90f48 SHA-1: b1035c73f6a4c793d46e31642ddf18803f412c67 SHA-256: 3990ace7060105cc2146228c2d264a96b6fa843cce2b474c4c26cd4b72f2caae
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wo-kop.pl/userfiles/file/58347596186.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4732351f59d6c2b2dfe001174573bbfd/lezezogivifore.pdf
    • http://frezerovka.by/images/fxeditor/file/35967314130.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/acf813011fc0a6814c5ecfd9a0c51f94/40904844043.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7c49020d3---38009482048.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fc6q6des25osf70kasc59ohn61/susozapedijekoxoder.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1c181c742b26d11694d29255c60c57b6/27918202481.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fe439d67---jiwufudezuwuxa.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/897mcnshjngir42ko2lu29objo/55101903676.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86108d4c57---dovosewopijujafon.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/68362b92c1e7ad01a20c86f67e1a762e/71514772177.pdf
    • http://adance0112.com/upfile/editor/file/biwigekikipuxonub.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b234ae71d---lojopetezelatul.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ls2nl1ighm686oceenb5u4ub7f/3743582078.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/m6cb62e29pf1g483n46as6a8jo/87643417051.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/53e91e1c8757e6a2d013a622d5eb63c8/wurupipadalu.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87867d0c57---nopum.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add6c517ca5---40100125381.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d60acce4---88824322816.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5318ae57---fovefaxaxa.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb8430003---92569514157.pdf
    • http://kotolantopeni.cz/file/pobubexaxejepajomarifofu.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/75889106250.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=if+these+walls+could+talk
    • 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_off0000f911.bin
cda9d0c9b01ea979536568f8a3d27001ab33a5df031f19d655dd143beb3d5636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 10508 bytes
font_01_sfnt_off0001113c.bin
dd9b330a3279eb034c0fe6c0ebff5d364263d5e265d076cd247fe83ddbe1e889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 17972 bytes
font_02_sfnt_off0001406a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 16792 bytes

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