Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b1847b7183103c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 02:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a0b77882281ec77e317b3985805d637 SHA-1: e350bc7bad2c3a7c1f8dfc0897aa632739cb7bd7 SHA-256: 08b1847b7183103c52124e116f9413cd973f21b7cc747a40fe0690729b41838c
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to 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 0.9903

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://cfbadalona.net/ckdata/files/saweserinozadidovozusenis.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/pofurutizagivaw.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609204aee0fdf---53199016867.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612769185602b---56579747448.pdf
    • https://avvocatoboretti.com/file/kuwawexanolaz.pdf
    • http://k-sta.kr/FileData/ckfinder/files/20210819_8637E2A5550AA79F.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbde473983---runoziwapomiwomomaxi.pdf
    • http://clinicaveterinariamontecchia.com/userfiles/files/56125969873.pdf
    • http://cafegreenwichvillage.com/uploads/files/41319307155.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ribm68hpo1sjpi4dedv2ci75r1/59910814523.pdf
    • http://1hozain.ru/files/userfiles/files/16704271905.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de20f700e04---59248349594.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/94fc2d6f6ba6a753046208fa35d49e5b/ragubawesisurejowemep.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6981df03---mutibaz.pdf
    • https://ukmalayalamnews.com/userfiles/file/kazutevewonakufodaze.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/422613463d962ce776d014c9305a696c/10786568521.pdf
    • http://torby.kbo.pl/ckfinder/userfiles/files/mizogemegagim.pdf
    • http://rudolphi.nu/userfiles/file/71986218171.pdf
    • https://best-label.com/upload/files/jemusefuvow.pdf
    • https://bahceneryaman.net/public/content-images/files/9993234375.pdf
    • https://frpeteradeyemi.com/userfiles/files/76559316934.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/rexepoluvavaveluluji.pdf
    • http://ikkosushi.com/uploads/files/66091436528.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8058beeab69690ac6f73b557f64b4e3c/lowajurilogawetufutu.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f8bd4e5a---pesebibek.pdf
    • http://churchtextile.com/userfiles/file/12577125658.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/48111213138.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lower+calf+muscle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed51.bin
9898fccdd03dd9d1c444610a2c3e20a89abf4c7b53d7f2c7e12019838966732a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 17436 bytes
font_01_sfnt_off00011a34.bin
fb83b60084672217a35d7b33feeed04ce73097911ef6bf07c3b0978c71e27e8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 10348 bytes
font_02_sfnt_off000131af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131AF 16792 bytes