Malicious PDF — malware analysis report

Static analysis result for SHA-256 c908abc7005dad28…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 16:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab115b389751d637a72b93a41ad530e2 SHA-1: 239bd71a7645068af341f73ddf03a1f865c88328 SHA-256: c908abc7005dad286a47c6fbf25c80994736b59e9aae94b026fc33a9d0be5819
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm nature are common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://e-room.co/userfiles/file/bozedudisiguwol.pdf In PDF document text
    • http://bhttourist.com/upload/fckimagesfile/52983473778.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/giseporepilonipuwowi.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/mufiridimidok.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/jasiw.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/xerib.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/af970bacf315e12e89a1f63a2509c3d7/97924900588.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210901205254.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140670d3a6c0---62907119739.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/77393372350.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/20438580347.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/73919153905.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/sevowizimarop.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/xebeludoxonazukumik.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16146fd8603ce3---towowumakikawamuro.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/6703961448.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c6408e82e0040f03209e5dc8d47b3555/41387651912.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lo6pah9gki3a7k8iie23budjnt/31930278962.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/keradov.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/19955658284.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///62677737651.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/bupeviludazi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5afcba76989f66a5236072dde4267df3/5966425890.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109190438559649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fifty+shades+of+grey+full+movie+english+languagePDF 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 18916 bytes
SHA-256: 2a85cd5503727fb48de0fecf64efd3421e5afe4c3278e10b56775dbc10ceb8a0
font_02_sfnt_off0001342f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342F 11060 bytes
SHA-256: 934a87318a8c73174ca66386803e634338d7f6ff5b423b74d8f264f9e4b51d94