Malicious PDF — malware analysis report

Static analysis result for SHA-256 d464d00d7d77a38f…

MALICIOUS

PDF

73.6 KB Created: 2021-08-29 09:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a25e0628d95706b1a0982ec61919a57 SHA-1: 70552f160aa8843b80c54265e8e2769f6ba81306 SHA-256: d464d00d7d77a38fb576fa4a6fb1ab276b36ee7f7de9ed48a21ce4b8bd360ea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute phishing content or second-stage malware. The PDF structure itself does not contain executable scripts, but the embedded URIs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=direct+and+indirect+free+kick PDF link annotation
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7dabfa48e17865b00b87757ac3169c31/75622968039.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/nijubukivopuxedi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/853631a7f8970bf170a0bb31f6e2cf47/kubonosu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608414eae985d---26021129205.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t2cold98a74lndgb2bltj023u5/44495887653.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/bef9a3f40047c9103dbe0ad1ac5b19bc/22198874567.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/wegetilupot.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/7261329443.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/512a236c127202cdac60f6ad7ea1d030/94717756785.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/janujadaf.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b918288f---kojigeboxotojolifus.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/76714781949.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ddef16a4650f6789f09386e6869932e9/levexasopuvapi.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/wiwetazuxazalizugukivas.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a384d2dcd6---xukokasajosorelojotetubi.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/34547683532.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/66211116152.pdfIn PDF document text
    • http://i-dron.cz/data/file/suxivipazapotemizogugamid.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lawuduzawirilozitalobuv.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16a8eba36---nuxoma.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116db5b5f735---71944371591.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/kimovevulebiworimaw.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1b3ba136f8fe8712120dc6afe62d0a21/pigibupizuvekodojezipu.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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 10228 bytes
SHA-256: fa4506ffa0d449693b6e296b5eb9e56983f6ba4f6ce9182e94309d31af80fd85
font_01_sfnt_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 16276 bytes
SHA-256: 3979999a52cda1cd4691da33e71a6d666c0a5bbe3a2c653a2676056c1d964554
font_02_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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