Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa79ed979d4af04…

MALICIOUS

PDF

108.9 KB Created: 2021-08-18 16:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 277de34a5a40dad2f9b775ea42c48e9f SHA-1: 6b23ec18589c8e687ca53a798e0174b4bf89f020 SHA-256: 5aa79ed979d4af04092cf45479c697ace824a753ebccb2de1e05d5bca2e59ac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://forepic.com/_UploadFile/Images/file/jirisezarutanubemu.pdf In PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/domajemadapozi.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/35030042188.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7734575ba4fecb1f31b987a109c23047/66568606575.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/hl1o264ddthf1o0g68pibp2t5g/nisigiwoleza.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/5641747570.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a62cae185---92958532540.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/3210526191.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856d6da90b9---mematenibexi.pdfIn PDF document text
    • http://soupworld.de/upload/file/tololaxanulinesoz.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/63762319483.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8803a844a---sesagiruriluro.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/saradutepuz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ab8ba1e1---bojutana.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/22626e9b8e9c56323780886e54f5ded7/tevisovazorovepasitisiwu.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/sipasesisesisolilelu.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xomuvivodusireg.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/67792189094.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/88020259392.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8e648686---xogaderejepevepefegorefo.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/87010742683.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607564e345cac---35561355854.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/2e0b4d7b3bb7a4c2fb8bf7deceaaeda8/96869965713.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1628247210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+oster+microwave+silentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 19144 bytes
SHA-256: 1e77d49944ff42b55ea3aecc9b0520136372f6dc164f1366cc244765e8f232c2
font_01_sfnt_off00015f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001774b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774B 10624 bytes
SHA-256: be6ee8b69901b660db590ff2b35b827c71cebeb0f5ff9d6886dbb3ca57b63531
font_03_sfnt_off00018f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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