Malicious PDF — malware analysis report

Static analysis result for SHA-256 25110433b293dd20…

MALICIOUS

PDF

72.1 KB Created: 2021-08-07 01:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b61361a98d217a82f832b1d6a0f5248f SHA-1: f95d5d2e91665615e62c489af3745fc0a59887c6 SHA-256: 25110433b293dd2067459ee3e1342850e03f81b44517cf027053976d56df17b7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. These links are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6162

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://archism.ru/uplcv?utm_term=human+sexuality+diversity+in+contemporary+america+pdf PDF link annotation
    • http://glotecgh.com/upload/editor/file/79355466807.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/ziposowasimugazojubep.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e25f2fc09---74460979916.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/87371492098.pdfIn PDF document text
    • http://alptw.com/images/files/79352436568.pdfIn PDF document text
    • http://terminsk.by/pics/files/51591688734.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • https://scriptdd.com/_file/file/49011783046.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/65f3170de41b83066591951f88b0c77d/66313479359.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/880d13e8a89e7e1b0a02084b173fe65b/6072205061.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed00a24354---97099561329.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/41747435660.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/rezilavojovixes.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb86f1c93---rureturerawi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/c0r9q3ff84nidhliv6eks8ven0/danesexijajolinitu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06b995304---48986180951.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9usvqqdtpp6alu2qir2rtg6ros/23420640522.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2onk3jlka4a4lp9bbjhra6eb17/tuwupavefawobonobotani.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0debf297ce91050db6337a07b7f6a322/67308344318.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/nevelawekikeg.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/34594838198.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jikevofileku.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0789f125a48884f1cb6634c515f3a484/33081652177.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/zozalisarubos.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/juuin4n558skvkgi2bn214nmv1/77457809110.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65e5d208d---bepikixomemevuxoru.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88744bf3c8---lafinilutazilitefafi.pdfIn 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_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 11152 bytes
SHA-256: 4c98a3394eddee539d1ad4b292f429af4dbf8535d624e227fafd5d7c2e6d7098
font_01_sfnt_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 15400 bytes
SHA-256: a963055385727e431104f6ea2d47c50d79d36bd9833226ebcd11000c1d894e38
font_02_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1