Malicious PDF — malware analysis report

Static analysis result for SHA-256 f514b018a83b3529…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 12:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa8b11b2901480d42c198f357abd95c6 SHA-1: 8ef99f9e30c6be4330dca99b25d5659cdbb86dfa SHA-256: f514b018a83b35297590623db9abb2f72128318b7d502a30f3fd8e0e0600dd21
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 compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=android+app+for+pc+free+download PDF link annotation
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/92717393079.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137555248022---pavupenejo.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/xazabaxobiferodinobot.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/69324686611.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/53149789890.pdfIn PDF document text
    • http://mebco.ru/images/file/5491148878.pdfIn PDF document text
    • http://minipit.com/data/files/42418173673.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/lepilojebixa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9d2e998690737c8d1fa3283353fb09f7/91842838448.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zififanebona.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/63346800264.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc07a7351---tojofuxamabolodageri.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/tazitupebumoxewepojugojeg.pdfIn PDF document text
    • http://soupworld.de/upload/file/85428150082.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/kojakoperavudak.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd6ce23f1---dosovixip.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bef0ab4d0---17821052542.pdfIn PDF document text
    • http://strap.sk/uploads/files/74386188381.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/kukexitosegomivi.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/81160657128.pdfIn PDF document text
    • https://eclearusa.com/images/file/79276687716.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/83973754103.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901233819.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tuzuvisosap.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/lewonuvuw.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_off0000bcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAF 16708 bytes
SHA-256: 269c71f30de4cb68b91434d9079510b9897044de0f30d1757b98d056c2ab9cbe
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10412 bytes
SHA-256: 95c1f2c88a3a91766c612d4b20364180ebd050fdd117a750771e1c37225ba650

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