Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d51eeaa549a09bc…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 08:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a029a98e13b0e425a8d9b486d808bdf SHA-1: b868cfcfe3470e03ab187e8d3280898185ad4b05 SHA-256: 7d51eeaa549a09bcb191afdd54466849a77cb50375e39d4af4c1baeaed213504
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=critical+race+theory+introduction+pdf PDF link annotation
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a284f70a496---65266100714.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd1776a5d9---xefaxogadovovivegi.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/60307297848.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bfe62420931cb967f76209be1d282091/40196837689.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/10588275744.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/81703107946.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/67853615446.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/19521534137.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/73426049435.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/54612829261.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/paselodu.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/48507882956.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a52b06bd9---59383502460.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/mitepuzawizezujunujorubi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1c792e86d3aef5d7e6330385ae6448dd/78320654263.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a3138f4c9---biwubuxodebutobeg.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/39227711521.pdfIn PDF document text
    • http://ahknchem.com/upload/files/2904598201.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/lopamivobawesidexisivipo.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/1368633262.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 10796 bytes
SHA-256: dd9b5b6b803619bee4048feb4b60729212e3eabd49c923ee1bacd15ba54967e2
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 18048 bytes
SHA-256: ae3fffd7ab23187275a49070241adbdcdcc30bb942752d246dc2278f25bc1ed7
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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