Malicious PDF — malware analysis report

Static analysis result for SHA-256 b398eca2688f360d…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 12:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26b29edc5677eb15a24cd686eabdfb30 SHA-1: af559b9a7e7055273407e425f7d3acb2b4f1ed92 SHA-256: b398eca2688f360d8a8f83e403c4d79df3722b9157e7afe17a290d2bb4fc3d55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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=letter+requesting+for+bonafide+certificate PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e3f0a9f36248c2c24cf7f9f40ef1efc5/31728004474.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/mokuzimumorojulu.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080196e7129f---nuruzozexaxigofojozajorox.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/96085786741.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e073761e337---42809960173.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/213b0fada19f2e102763f653b1954427/30954193939.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815cbc46148---fokawekunejikejiro.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a206b5e03a---serozigekoxubefodujal.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3afa593350---75964719336.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/bedukoliribijegudo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bfb9a0ae3---33799791077.pdfIn PDF document text
    • http://hopsch.de/uploads/file/sifesalutapudupuzolono.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/jotilewofupegog.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1op3ovk368dnea05m2l09todo2/20792963794.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/dc5d9643651d273c3055408d1231db7e/94945211963.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vakusuf.pdfIn PDF document text
    • http://www.heksan.com.pl/file/27410684807.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081d58b3ff---fatiru.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/29j65bk19rib98goo76kt1tnu6/45808093149.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b764d126f9---wadexerapupibizafin.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ab6f83100---88708679212.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/95880247585.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1cbf3cd06f550d15855ffed1be098028/zaxow.pdfIn PDF document text
    • 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_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 10948 bytes
SHA-256: 900f119ff713f47737e8df6a483bdfbecf26080a7f0bcfa0664042e4a08a4c5d
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 16288 bytes
SHA-256: a62add502b8fdbe8d2a0dbbe305a84f6390186c95bb0298a822c057a98143200

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