Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd68df48982cb6ee…

MALICIOUS

PDF

83.0 KB Created: 2021-08-13 15:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73d12a4b3f52332b316c36bffb6f1bb5 SHA-1: 6a3741554a195025a4eea227d24c7974a0a69548 SHA-256: bd68df48982cb6eee1d24c6b3f60b9ea6e889fd17d347f417782a15d2aebb2ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://samarthanamparisara.org/apadmin/uploads/userfiles/files/torotenuxurozixeliv.pdf In PDF document text
    • https://qqhanoman.com/contents//files/gigesutaxajopa.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/94687487388.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/58012683214.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a293f022688---69577880510.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a3c129634de54050a62a8751d6abc88a/30040836036.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0ee51bb5---kadodasifonoxamitu.pdfIn PDF document text
    • https://actorconseil.com/files/file/77819730431.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a641ea484d4---zibuvofirusosekeleg.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3b3c4d658fc9717274ff3c6093b0bd59/xobipaguva.pdfIn PDF document text
    • https://dm288.rs/slicice/file/76574266092.pdfIn PDF document text
    • http://teifsepahan.com/files/file/27175673595.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/semovoxuvajelazudewem.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj6nk6e748163pv7839s6s04a0/luvidufabukefunu.pdfIn PDF document text
    • http://fedoro.ru/upload/file/32870308106.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/jajugamexagajorun.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7043eb704bd3ffec8ff7b404bee07af/59413172108.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-25/20210525191527642552.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0864040d---18585746132.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/62722993813.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609001479148d---27841255835.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/kuboginiwokonila.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/26143805510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+lesson+of+the+kaibab+answers+key+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_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 16448 bytes
SHA-256: b76f7975461e24c7f205ea6dc735e4581dae7e53ce3081e742e39098f3fa3fe6
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 10992 bytes
SHA-256: 1df92fae3e5cb60bc8a30a7c82a64210bf20025ed4ea350ab5df01bf73fe2f50

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