Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82d2fa2267726e0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 21:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91e2a82d67e4969e2dd8c24dfc560171 SHA-1: a2e8cbbe711364fa4496b6d63fb6113ea2492f86 SHA-256: a82d2fa2267726e015aae592ab33e060f0db1e52a50e32917b03a64ee6545fdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and numerous URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=anterior+knee+joint PDF link annotation
    • http://aarogyamedico.com/userfiles/file/67074647775.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119e423465ac---50878498437.pdfIn PDF document text
    • https://webmenuplus.com/images/file/23032260969.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/29873699874.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/29783872322.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160980533d3672---vapadixid.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/533a431256e30fbb1421af6117c70299/basuwoxelozejonoxe.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/naroninumatosofikuxa.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/1963822801.pdfIn PDF document text
    • https://raljob.com/userfiles/file/93223726395.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6b1eede91---89857328119.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160da2d3eb6019---goselufatorapivo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4vm6iql36689sibej0qa1puadk/49276054641.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161261dba0bf40---wejubus.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/lowunobasugupowewemabojo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a268d5f0788a6c1f18ee5878c0bfedec/91530136561.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078c24438b18---gubevuzizav.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/fimufixafezaj.pdfIn PDF document text
    • https://termocasasrl.com/file/59327593114.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/loxireroxoruf.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/45076201138.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/677cf9e0c05ca102819c75367e0b8f56/pikevebitalab.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8060787a---savojamabipakafuzapijaxa.pdfIn PDF document text
    • 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_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 9928 bytes
SHA-256: e9f525033492c9bff196cca74ebd0fe84d9f6f4cee6721f4546d1170845c0164
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 17836 bytes
SHA-256: 336a4110a996bb19390620846e1369a70d22e45f5c87724e7554d14143c13a53
font_02_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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