Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66f6924aa99373d…

MALICIOUS

PDF

77.9 KB Created: 2021-08-29 10:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4f7a009cc38c1702c3834e52792b03a SHA-1: e79adf9b1c7f8fc91bdc963198312bb5dae1d797 SHA-256: e66f6924aa99373d47c64645730fdee32fb8ebec2a28ebc05d965bc8ce9fa175
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm on potentially compromised or disposable hosting. The presence of numerous external URIs, including one pointing to a compromised WordPress upload, suggests an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=what+is+my+mobile+number PDF link annotation
    • http://novichiha.ru/pic/file/bubimitevitoxakifelupafu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ac5bc7b9f---xulotugesuzufelusabex.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/390c9162257a8f9fa0bd98b15df8020a/4454122607.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gisudunemavenoza.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887e4659b04---58184184242.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b7635f209---54203976748.pdfIn PDF document text
    • https://edarky.net/data/file/pesub.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/tinapaxeri.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nikojudovojifekopodite.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085765242888---lajibabesa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/92058228519.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/51349242131.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/24373995478.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974732f338---zijawinovoduful.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/41a06e75c285d9ed2026044ee5a489c9/vepakutojez.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/33903267926.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/70986238048.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/tagixadujumuti.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/84281220899.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/49191237440.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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 17340 bytes
SHA-256: e054c859aaaa5462411d559ee23c551ab8a4233185be210117b13c5b036af749
font_01_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10720 bytes
SHA-256: 4a7deb07a1c1dba67eba60bfb9d96bf58674b973912830491f4c6706079fa1a9
font_02_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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