Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c00c1ed7881a62…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 01:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d79a690e3f54868cb16c0030980000d SHA-1: 97807e6b008e66f5ab1403efcb6f86442a669911 SHA-256: 17c00c1ed7881a62da22518ad04b1ae018baeb30e4e3fdd93333b12ed93cec06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://hansungid.com/userfiles/file/wixuregodoxizozidesop.pdf In PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/13330204052.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/93382677613.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/40587408349.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/71998332044.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/xesumaruzidim.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210905161630.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nir4vfti51bpq0bh85o8mg5kv5/95979460116.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109071527142741.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/bogitibasupugetesu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda5f4935f---denusomaligawigufelilizex.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/76244154482.pdfIn PDF document text
    • https://medtek.vn/storage/file/zutoromemirijoma.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabf167d4b---50612248143.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://zulassungsservice4you.de/bilder/file/bikagoruzokatufupoxowure.pdfIn PDF document text
    • http://d-innovation.com/upload/files/96328128639.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/makizulidodokafa.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/xobugomajimuwur.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/tofumowadezokaxopipu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614474b341663---nabasuxuvubapagututevoz.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/34876143033.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed7a05792---10474999141.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/24248476672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=webgl+chrome+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 1996 bytes
SHA-256: ec4d74a441de9ca94fcdab046e62d4d678cf1435eaa09a9fe53be8737d4845ce
font_01_sfnt_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 10684 bytes
SHA-256: c179b04307e0db11240f34e6df1de37150f48deb14a6caadd2ce1651622471b3
font_02_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 19004 bytes
SHA-256: 56a1f66df0f30d0d51035a8b5937a658aa1216ac3a9182166c940b5b510a2fde
font_03_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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