Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aefe0612401a791…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 01:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f306c216cdd838b2ac74e2d3950cc100 SHA-1: a64b84930daf5cc4187a26007a00ab52dc5c7db3 SHA-256: 5aefe0612401a7917f367ffab465dd43a8cca0eb7b28ec5468e795c9281a2598
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://gruntbudowa.pl/files/file/diduwifusiregus.pdf In PDF document text
    • http://weilandvloeren.nl/fckimages/13109801364.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/49577304729.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/vilozuzufozevovixokaboxi.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/mifatedabe.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8fd342463f40911fdb6e3d4dc9084ed3/74939562961.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161474e4b72eec---87991854558.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/10168192182.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/tigagelapowukisigos.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u7uc7u328047f9n5eob89a4fu6/61302364602.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/kozafofakusisiteribuxad.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/zadazinudofazuwu.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/puzuluxibarin.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3920058967.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/41282491705.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/gebim.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/66822190208.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/jitemopofuzitig.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wusogejananokukuluda.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0c902d88---mamovoguliriz.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dirakufiziberimisamubam.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/11905009088.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7bbb0d0c2a0a303dd18a446b1601c3fe/66720664311.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e0ae71bfbd96cc69d65a7db2b5c065ac/murat.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210904010443.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/kajoxuwuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+craftsman+mod+apkPDF 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_off0000b24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24F 10736 bytes
SHA-256: ed0751ad9181d9ba3b554c71d8b5430e2ac544b8198e3a142f729e3aeed71215
font_01_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 14808 bytes
SHA-256: 0db947bc8f6b8b4f4afd83a89f8234a6aed2b8065aad602a3b0d9586f30feb3b
font_02_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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