Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded661aed6699850…

MALICIOUS

PDF

80.2 KB Created: 2021-06-30 21:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d436c5eaa34eb81b81644c76b08f08dc SHA-1: 6fe4848c8318f1ad50fdb46972ba7565449f700c SHA-256: ded661aed6699850522ba64e3425a16f38736cf29106210e1aa894e1fe399368
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farms hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=cool+castle+builds+minecraft PDF link annotation
    • https://dejavuruse.com/userfiles/file/97799466762.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/pomaxafitebaj.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/37ced39fc4680b8ff3e1e416e0ac5359/61839290803.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/109331365660abf64eb7cf0.pdfIn PDF document text
    • https://anjingliar.com/contents//files/xuvuxalavekerowufam.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082de6b2db6f---58743061057.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kofudogogorawekunoto.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/n53fcs9k1lvnmm2mj3vg8b6qvl/54396336675.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe5b2d8c7---gifadiraxomoratomilowa.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e5ce8e68---22508440865.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c5592989d9faf310474c624116b37d50/vikuzerijenofigigobenef.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/79qk3f00ukij7g51of7oe0mojc/87264346187.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/pk6tod3a7opjq2s8n41p4nu909/61304625397.pdfIn PDF document text
    • http://juha.be/_files/file/21104732487.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c836f89fbb---vogibilukipi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/tujewo.pdfIn PDF document text
    • http://cloverdiamond.com/file/59046679886.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076acc313c78---tatijabujafewit.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607592ab3579b---nifaxomoxufosije.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/str0si0g93cqnq9di7ovnpa7h5/mawigaligexolete.pdfIn PDF document text
    • http://fedime.org/imagenes/34539274002.pdfIn PDF document text
    • http://newo.ru/files/files/xoxeditaxabowuni.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2c8b79e0---99424154429.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9a1fbe06020521e4b0815593bf15c995/84510871067.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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 10908 bytes
SHA-256: c6d52473416eecf08a7d700d8fa5b2a6064496646a38c209acedbcbb30198929
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 17308 bytes
SHA-256: 23565fa1a22dfa2edaff0913f61f874ba844b7b379b8ef1948098110eebff80f
font_02_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1