Malicious PDF — malware analysis report

Static analysis result for SHA-256 db168403da8aa58e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 13:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce57f6a6a2725cc35019fefd46be340a SHA-1: 63b8bdda9b1e988dfec4f74cf4f104d2ab0ea1f7 SHA-256: db168403da8aa58e2672b68e64ab91d061b8da70e7968962448a794d6af0b00d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=cccam+server+apk PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613d310481b10---43786714799.pdfPDF link annotation
    • http://hitplus.eu/userfiles/file/jenivi.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/13966887046.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/72658818434.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/23194007445.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d8ce5061---jututurajirepinunuto.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/53547480291.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109110103442387.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb6905b1b---kusozalulusiguwutavenit.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/koduwufopilorovejeguru.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/jiramubumoziluru.pdfIn PDF document text
    • http://strandedtattoo.com/file/wawagejud.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8e82e060---64608484649.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16140c75fad528---fuwanezezalukute.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/wiromakapoligab.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/75191203838.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/29915404581.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/57215614724.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/10876510151.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f19e56206---wakunojokegunekapobi.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/11341031589.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/sepoguma.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/89020773766.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/76113020472.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/51144907021.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_off0000bd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5B 10264 bytes
SHA-256: 7662df51fa941fcf3a50074b1267f6a7d125fde3b6f232ca216bb23a22a762aa
font_01_sfnt_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 18428 bytes
SHA-256: 789bb43bdead7fdb441411b2afa3bb60a97a7b122a242c7537a2d1bba800272a
font_02_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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