Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b86354159bbf2f8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 23:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de60d66b9069b420d37e5dbabe087ece SHA-1: cd161d0ef2e13bc51d28b40a51bc01b322a2624d SHA-256: 7b86354159bbf2f8ccab110d6a75fc3d5ff9f7c48e5626483ed03367a8a85d63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristic firings like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=pirate+proxy+australia PDF link annotation
    • http://tunecharts.com/userfiles/file/difilo.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/73138869178.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/wazuzirejorekafifepulowa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7fd4e511---vajokike.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/1536149329.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/fafanaberunomederurajegi.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/71577637605.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vesuxure.pdfIn PDF document text
    • http://ukrfirework.com/images/file/11928643579.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/widedusudifirojumege.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/gojenuj.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wijajofasekezurejakikos.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/ligagowag.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/11585155600.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/jogogokufatu.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/putonalanig.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/jisonomonozunovobaroko.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/bowejibugegomabor.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/sumedoxomonetojiz.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/duralubovugotigubukeni.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f5594af8a0cd79f6eb098f071f816297/silejofiburiwasexufupipab.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lelariwoserolezoxaw.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/pikexejofafaru.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/porokoxinevinevatemivo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9f07fcc23ac17c210b8d9c5a55fb5e19/fenogizulonivun.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_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 10456 bytes
SHA-256: 932956c03ab0d8b53e0ae772e769932b13d0ca20c90db5a4111994feb4fd5ceb
font_02_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 16580 bytes
SHA-256: dc3f5909b05a2036afb7190328015aec89d1fee446b05a3784fe4e0273da8e31

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