Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dae53a41c6a84e…

MALICIOUS

PDF

85.7 KB Created: 2021-07-13 17:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a1a725f675a56adce37867396bd055e SHA-1: e07625d747465b112b627b0284679e2436af8b22 SHA-256: 89dae53a41c6a84e43479ad05129c6d40c13ed6c3d2ba9c3286442e48259c2f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/51066671171.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092404c4f379---sepomademanovimotimokita.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be94cdbd2---2885482600.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084d506d4b34---32134578097.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983edf5727b---xetowuwajusajexerepul.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/979c0e555d243cf369d7f2da834b1cba/diwadikirosotejifuber.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/mojodu.pdfIn PDF document text
    • http://digifast.cz/userfiles/bisuwi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e906d25fe90---tifidezomaxiserenozov.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/63aef63bbf7cb8ee741fc7a290614fc9/kijoratudinadekog.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ef92fbfc4af9ebca709a43893183d44e/98566735628.pdfIn PDF document text
    • https://actorconseil.com/files/file/53512345753.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/rivon.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a0dd9c8a1b239434330f27ac7764c2e6/51646558937.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8edf281639f2de5421f201f2bf011588/wulazeromewebupininud.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160746d723b0fb---vebukinefesafizowamo.pdfIn PDF document text
    • http://benetalent.com/upload/files/4831354411.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812db72470e---79983852813.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/50898841135.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/98082092455.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/vepinusim.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83905ecf6e---midobal.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhs3o6oaejorhicm3iv5gfp24g/gotemazoxonurasalir.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/furimibusuxojapovetipam.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dc1dfba1---71020142002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+get+permanent+marker+out+of+jeansPDF 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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 11216 bytes
SHA-256: aa2003239faadddb6214ecb25a9befa737430b43cd459a5e395a8e301bdbe609
font_01_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 16924 bytes
SHA-256: 8e1cae473f00c19a2fc8a48d8d8f3f0e11c8a6cabceada206c8848958e0fb242
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1