Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72409fd49ddf35a…

MALICIOUS

PDF

83.7 KB Created: 2021-07-29 14:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ee2af65b0a4acaab483d6ca49a8342c SHA-1: e6ce20c7a58ac66dddae9ee3e79f3b9bd41a9a10 SHA-256: b72409fd49ddf35abb6783ebe6c343a6f4d9e44f9c606f0b51f1128b6c79592d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://cructi.ru/uplcv?utm_term=lucky+bingo+wonderland+redeem+codes
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083efea360d0---93892125499.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c804ca5d0---tebelixidutuvugegazer.pdf
    • https://cottingham-group.com/cufiles/files/88467501919.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5d46d742e711c3f15040ff2080242131/34006814183.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bf4426b86d59fb3feb79e1d6894acd29/gadorofozorijugomo.pdf
    • http://arcomproltd.com/userfiles/file/barimifugifotikufidedev.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e1718edd---88062149458.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dbeb90402---zekugaxano.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4567afd6879e1747b708b0cd060f3eb2/54265493719.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kadvnhc5kv3mhqkl70k5cc4845/7235860300.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3m85cn68anklstgirgtqdv8ht2/47691626127.pdf
    • http://delannahotel.com/user_img/file/65708449373.pdf
    • http://conhantaoankhanh.com/webroot/img/files/gudorasipaze.pdf
    • https://mariellatriolo.it/public/file/ketonusigisuriwefovirawij.pdf
    • http://camionespanamericana.com/userfiles/file/beturelatifavapefawil.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0b362f9981010b5571502cfe8be45729/57198031194.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5fd2907db2e457316730f324c2833224/66996039312.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/146be762f8cdf480ba4d12588a42aa30/59054361572.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/gikepobonulawuvalomozovim.pdf
    • https://zemiigori.com/uploads/file/dipoketedor.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857292b66b8---lijedejaxeju.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b8910472---vidotugevosodisutojizilu.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7kp7e9acc3suvgrh8s9s2kjch4/gogetok.pdf
    • http://cuacuongiare.vn/upload/files/sugawojiwano.pdf
    • http://sk-uralstroy.ru/uploads/files/51195470479.pdf
    • 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_off0000e3a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 16792 bytes
font_01_sfnt_off0000fbb7.bin
f66519c014671bb1e2225ccf7b557da6d64cdf50cb9141dbdafc7fa0fece27dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 11104 bytes
font_02_sfnt_off00011573.bin
7763e0bd529129e31bb2d176b3c6ddd7bd514a0437a665af701bc968f947bb79
pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 16272 bytes