Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b86d8bcfd85df1b…

MALICIOUS

PDF

91.5 KB Created: 2021-06-27 21:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cc8b1d1a192ec4a6f6346fbf7aac90a SHA-1: fe076da78d83ac04e645a11e4dba52bccc4f5981 SHA-256: 9b86d8bcfd85df1bc6163bf8ca081eb72d5f9d3b10d07f2c520b12ec7e4b7c7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://trendymamy.pl/userfiles/file/wetidiruvilipede.pdf
    • https://geneticapanama.com/userfiles/file/97781088390.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/pixalofofojaxes.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c756e0e11b5---somafodixerizokanezanagav.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa405728783---83054395198.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d53de3cf9ea---sagarixujifi.pdf
    • https://aadharshilaschool.org/userfiles/file/24925749176.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ce598ea3---leserurotetu.pdf
    • http://learningkey.org/userfiles/tisulelizajifutozo.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce21efdf2d7---lelegi.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/haobds9jcm77ojckf1eq6nu1hl/2748737738.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e26aaf85d---24849954144.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b9517d81---badixoxaverumiwirige.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7278956c---36312458569.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a07295556---perefakuzi.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160745635a7f51---taxawopekovesogupujesap.pdf
    • https://alianzatours.com/imagenes/file/zejitosi.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/bb5b28c1e9c7b41ee5acae10ec5a4c94/40207092440.pdf
    • http://goksirlambinowice.pl/img/upload/files/netemigugukisepamuxezig.pdf
    • http://prociweb.hu/sites/files/file/24502902686.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6581ae48---wanalerovanu.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf95bd8a767---44219216776.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/51c38e3a6c960e95afff64ccb195733e/40052715205.pdf
    • https://betenagro.com/sites/default/files/file/nalarefogip.pdf
    • http://chinoboxingclub.com/clients/36032/File/26816477564.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=freedom+of+speech+thesis
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16792 bytes
font_01_sfnt_off000106ca.bin
e31fab4015232c968e3b303e02b08021860469b94386508534b3fb0f4af674e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16824 bytes
font_02_sfnt_off0001329d.bin
f0ef99e60859c444a470ab0dc68d2d034e354104179e5aa09396c1bf7605bd28
pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 10548 bytes
font_03_sfnt_off00014a9e.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9E 16252 bytes