Malicious PDF — malware analysis report

Static analysis result for SHA-256 4633b7580ed5524e…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 08:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 791c717de8dd584ca7cdf21a0557b47c SHA-1: ef39fb508368bc5dc8d0d0db790d26a4093ee797 SHA-256: 4633b7580ed5524eb4707c6e1a246725e0bd9d84e0773755afd5dc1799b294fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://crewmak.ru/uplcv?utm_term=difference+between+sliding+contact+bearing+and+rolling+contact+bearing PDF link annotation
    • http://isgsrl.it/images/file/15670402605.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/seniwemuliwixotuse.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ufkg0q0a84mfpnfveq07fnkpf0/molatazabitine.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/zifafenemubobesisejas.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/37264872484.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a486497b9e5936cfe2a00400e6e526ed/66151671747.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ca12339d---fumekanasadimaji.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/446a002ae249efd8d629864432377c61/28191904506.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac129adcf---kezolidepedozov.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0a507ede---14406929636.pdfIn PDF document text
    • https://ienter.bg/files/dukuto.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/54119799574.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5a3c2287971d8fced9051e1ff77fd507/8957553263.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823722594aa---viligexumexivarijupotel.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4534ae168---xedediluroperirarapi.pdfIn PDF document text
    • http://sivam.pl/files/file/lopufotaxonibikuzi.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/3393408b976c29ddd3e76b4d646b6613/tebusosabapewe.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/namob.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c46d24760---sugowirigefezosulaliz.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/20862676701.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10ae3465d6---xuvojogu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/827cd5026e2ea1058e370ce841dc7da3/nagivatitasixosafe.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/49309220992.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/90325713095.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e35529c0474737a280b845e356aaa914/mifoxufomolisitisazevete.pdfIn PDF document text
    • http://51www.org/uploadfile/file/49162993d4b2590fb6309c0fd4de5043.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_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 17484 bytes
SHA-256: 5716c8f6d5ecde4d335d247a9f0133c47f83cb56db492d68f5f3fad4d3e2688e
font_01_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 10880 bytes
SHA-256: 358c494a8db61965099f381397eea0fdf1ecadac4c124e385980505188e030aa
font_02_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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