Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a03c92df9882cf…

MALICIOUS

PDF

132.5 KB Created: 2021-06-28 08:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9d63486c6b9cee7b3c3bc5fc105b2dc9 SHA-1: 0e76925df6d5ea2d562b90f71c86e06c5f07234a SHA-256: e4a03c92df9882cf1504305a3c77d1cf4a632877ae3b19a3490708dffafc0adf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or spam campaign, indicated by a high number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f5e403d71b8fab95117443f254107776/lukekanor.pdf In PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/a46d890aabe4a981dd8e23e13220daaf/2745024606.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0b638474.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/jebekirawubu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9677b1d7a---penofazekuxemikaxusiz.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/593db6b375c7e76212af0d24eda5ca8a/xujokoj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823440814ea---23153609648.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c878938bff---nodututoxajagajalo.pdfIn PDF document text
    • https://promise-land.com/upload/file/48679286657.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/24984899771.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/68bd18b5efc677f49c823e660c8abbd2/9645278330.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3adad65034---84199231851.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57b1a582c---33708653119.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/14eea062ddb3289981f86d7277523cdd/77044748836.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788103e8553---296202244.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/64104289442.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vpldput793len4j7ld28ar85b5/vorerale.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///55527497550.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/92577535798.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/3c6770b34ef54211141d75d8fb5b69a2/78049530001.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072b5545b91c---14207690589.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c9c670f77ee3b52135ab604a966e741e/83876137609.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ecdf232c547679ccbaa12a7577038ddb/75300997064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+paying+jobs+in+precious+metalsPDF link annotation
    • 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_off0001a54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD5F 17124 bytes
SHA-256: 65fe8d111aaa8493525ca454787470391e19c10bcfcc220bc7b56e34798ba17d
font_02_sfnt_off0001ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA32 11256 bytes
SHA-256: 98344d5b776877e60176757cfb00b5270989e0ee582591433510d935f6106078

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