Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd1340c12df766d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 13:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca535cb914e59ece3f9a6c30709b663e SHA-1: e1d558b139b6f908e807c570d669d35f017cb314 SHA-256: 8fd1340c12df766d76f70abbeba7cbc6d4f3bbc90311052727e34dfc379d4605
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains a link farm pointing to various URLs, many of which are hosted on compromised websites or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML score and ClamAV detection, indicates a malicious intent to distribute further malicious content. The primary goal appears to be directing users to download additional malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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 http://alexhofford.com/temp/files/file/rafijezelot.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94ad31d7c---wesuvijaxowawokonunuteze.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/wuvopu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d754bf21---fujegebozajosep.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06aeb33d5---jipejirojom.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dffcb7e57---55397838180.pdfPDF link annotation
    • http://daotaonhaccong.com/uploads/userfiles/file/makike.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/meditabamuwapeguxuni.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a111638ec6---77002305988.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/xisamokovul.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/bofebedisu.pdfIn PDF document text
    • https://arerp.kr/data/file///23580664766.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/nefeziwaw.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/tibagaja.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b25b5080e---fifamixemixumiku.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa070c7e2---zedodokawodubotodiwuj.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/68365720032.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e3737aba---midusadexivefokavodudozim.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/bikepoxujubup.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/62515445938.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/673e13c5e7f2a0e09f61de7ff5bb2eb5/57114198725.pdfIn PDF document text
    • https://denimder.org/resimler/files/32684131705.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/45144213377.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jusisajuwozeba.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/pufijuzokunefumamogoso.pdfIn PDF document text
    • http://kahasat.cz/data/file/fikadilelixexuravafunami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rethinking+popular+culture+contemporary+perspectives+in+cultural+studies+pdfPDF link annotation
    • 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_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 17216 bytes
SHA-256: 6c22999a47cba84a2035080cb36393f8af34b6fb7b4aa0fc99dde1d9d5945eff
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 11484 bytes
SHA-256: 9b5a3d197668a6f86b9d8582e3b4d0a0eddd1e7e5fd6fae03df4f704d448906d