Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caf80ba558512a8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 15:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb1e64476c5c571f27e54ae1d4ed57f3 SHA-1: 8190145519bc596c4e73a60a812d7b2204c30221 SHA-256: 6caf80ba558512a86102ac3ecb0468c2be674688744c71c8105ad0952b3e5a87
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://xn--nmqu14inmf.com/upload/files/70670058551.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e5318d96---wopinosefafavokud.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd03f0974---7156865408.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/817a94e924ce4c61d8f359ca9691afb0/lulaji.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46f743008df79ffc619d183dda839052/19236794235.pdfIn PDF document text
    • http://findplusltd.com/file/bulexenijotabuzotoribu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/da9e848f85e1b5ede273bfffaa477355/55579431244.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/34070703391.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c581397ba1a---28784988462.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/pisubivuledodolese.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/jigekupefovixudowafirow.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8bb4422a2---xudavajedevesixek.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d7a3ad2ca---11168580656.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e4b3259c---16010118909.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef6c58ea0---98916490743.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0cebc28e4---38045934307.pdfIn PDF document text
    • http://cy2hand.com/userfiles/weram.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2dlko6s94b3e3akqeje84jrkpu/84716012614.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/fulegot.pdfIn PDF document text
    • https://85097781.com/upload/files/xumimegipofotol.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/82675399105.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/sobapupebinojenakemi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cd9afbd1---43608210277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=smith+wesson+5906+manualPDF 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_off0000be8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8A 11124 bytes
SHA-256: a9d5f0c6dcd5814ab9b70d4005740b3834eb51ddb31c95ddfd996668a3a0f05a
font_01_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 17648 bytes
SHA-256: d7202b62bf91e1cfa4679f2497d22fb42c14d8180b0b6017ce0fc2fba1b6f984
font_02_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1