Malicious PDF — malware analysis report

Static analysis result for SHA-256 163a415deb0af77e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 12:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d86928ea7d73db30647b537254177577 SHA-1: a13073a17c999b8cf9ed3e80c68994da1a836018 SHA-256: 163a415deb0af77eeb723106112b26a7594eea04fe58a7429a2b0719a6b5ac51
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a credential phishing lure. It contains numerous links to external sites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious landing pages. The presence of MFA/one-time-code harvesting lures further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://queure.ru/uplcv?utm_term=delete+all+messages+on+android PDF link annotation
    • http://trongtinpc.com/luutru/files/bigejumuparuboni.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/45929655685.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/gixerurimasedotadugenedam.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/fezapuvevejasetabav.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fb63a945---84801870342.pdfIn PDF document text
    • http://retailcop.ca/files/53837121452.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/saregaki.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/2363084693.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbd025628---tobufofisofi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/98706021708.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/78804820695.pdfIn PDF document text
    • http://balone.net/_upload/file///27815200314.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/meehpf31du6vrpfit3hsggp749/gelogure.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a2f0a6c69---kesom.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb843cef97---465121309.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/giraromotujokejagi.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/kewafubofuj.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/64775633843.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/nepute.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109112256166990.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/vularekexulusomunaruzag.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/42227560477.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/049e2fe968a8498b338090b17559f8fc/53646830475.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/58418486389.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/daritenapujisufona.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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 18008 bytes
SHA-256: 003038523830620a7dbc75f00835fc1ece3d825d3085e9cfaf7798f1e5264e7a
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 10592 bytes
SHA-256: a1114882358bf901a4349fa99cfa0cda0d95853e4a0970d9240e5553d0460d7c

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