Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37552bb8aa1e57e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 04:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11bbd11bfbea683f019f385acbbefa49 SHA-1: ed21fbd57cbd610ef1c62b865148b5c9aac0a9e3 SHA-256: c37552bb8aa1e57ed29d399af04e2f87b69422514bbfe663ac44768500ffd315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=android+save+apk PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d63a7fa27---zoves.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/67686264954.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/semibizazibesitu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361f1062c5---mizesolewexofujime.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/587858556.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/68174756164.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/16822156137.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109141812402566.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/22902392216.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332885397b---sakipapuj.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/lezetasofibuxowuzisalaj.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/furerenexitu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4d9d7250e---24682493294.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/ruroxesivekin.pdfIn PDF document text
    • http://erimti.com/userfiles/file/lokefitikokakilino.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/tiralizewoximowajokapesos.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/pagifasi.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/023a456764a8170bb55731b3d77444af/73025680067.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/rifoxataga.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/lemexozuson.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/jibexaxilowepirapa.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/64950771946.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161413c3f61c5e---67954999669.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_off0000b811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 18248 bytes
SHA-256: 540ece83ef0285f7da29e187fa4f020ec8aefe7b3e3d5c4252a55e1f96c701bc
font_02_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 10380 bytes
SHA-256: e5bd84bae6a3535f9f0809782e566cc7c82dde5780c9b6a744eff579f051fe94

Open this report in the interactive analyzer, or submit your own file for analysis.