Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cd73c0a0a352ce…

MALICIOUS

PDF

94.2 KB Created: 2021-08-21 09:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 62e79833ff3acdb5065ffa78934054e3 SHA-1: 4c0494304a2a281d05d2731ca7a6eec4a62d04df SHA-256: d9cd73c0a0a352ce76776b483ec39921a94e037753c61b4d6bf61619ca349c43
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gabident.pl/local/userfiles/file/mewatufojigiwi.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/830e407d81fab1028c5a54e527a92822/gozubajarawolilumixojon.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/58785312435.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/25588298729.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/81578429831.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/boxoxavijetupozunerebanew.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3679e506f3f3e05dcfbdfcc81b0a6c5d/7782257278.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/xopexirogimi.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/76501009839.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cae30a0836c---susarinujezebip.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/9938sb65127u0i0qpfarb6mpet/81887867129.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100f4813c8a4---29285659244.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e124767d1cd01313d36a56fe9417bd7c/11815108191.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xunetonedevizaravavalaj.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/61382160034.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/21481693864.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/vijirabewuvuteso.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zoviwasazesoxelaxozu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/79aa38b88fe055a49ac2cd0099bde1a9/jamumutubanubotaziz.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ml728jfopk3toskimp73fu8gm4/zijunafetuxu.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c2d42e98207655ac3222749de3a5385d/fiwizebafan.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/71802943830.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/70448569046.pdfIn PDF document text
    • https://t2sc.me/userfiles/meguwamewenukafofupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=predator+8750+generator+starter+switchPDF 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_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 18296 bytes
SHA-256: b7780230b0e11ae9f466377d92386e814a719e1493ff9d1938f1a24a651fc296
font_01_sfnt_off000137b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B0 11204 bytes
SHA-256: b158b3cce295ea94134eb60a01a8f7b8fe55436ef44abc89eaae6c6dec93a24b
font_02_sfnt_off000151d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1