Malicious PDF — malware analysis report

Static analysis result for SHA-256 1857ec25d4b2c09b…

MALICIOUS

PDF

99.3 KB Created: 2021-07-15 21:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23d3219b5a1ff14efe493035543ef0da SHA-1: b7a9d8d801ce4be1a73eb2526d6775d6d7c4198b SHA-256: 1857ec25d4b2c09b1c14df8d77dcff30ad5739b7aec89fa968b1f51150cc7bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host or distribute malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99270c00d---simovumi.pdf In PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977fa65b6f4---gakuziwilunumubajazifesuw.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7318a4db382b3e6f6d44bc88b69d7ff4/fatubegox.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/80918614345.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4f06787a6a8201949d02909dbff77163/xerixidunefisuwetoku.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/79387e14743022ec36c5486bd60f00e8/nuwiwofoveranigoj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9604b261f8dfa64d58a38f9d4d53d072/50704894869.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3j49f6avq2gjip4vkjab9quqoo/32056676063.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/nb3iissa67d22v99nncnrhnnmu/11859092521.pdfIn PDF document text
    • https://rcot.org/userfiles/file/87380861780.pdfIn PDF document text
    • http://nature-revive.org/files/file/66244277406.pdfIn PDF document text
    • http://tele-video.ru/upload/files/senegulevekudodikenukapab.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6277ab27d---5694304918.pdfIn PDF document text
    • http://kbchina.de/upload/zazafovasekijalube.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/reretimapebavorodamexi.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/66831533043.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/55211aa407e25cbe7284473f93ce3b2e/puwinirejudavexuluvo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/gizipik.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/9968583968.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae074a412---vogetubukabaguk.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/9025839865.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080409b58433---nodizas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=formalin+is+solution+of+formaldehyde+in+waterPDF 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_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 18552 bytes
SHA-256: 229244f7324c4f113c6fa5d573d7d9c89fd34aa01013f2823da932668a3d774c
font_01_sfnt_off00014cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEE 10896 bytes
SHA-256: 0c3bc711639956a7cdc9372e8fbdc737a444e7a821a5e4b2bfd70150a2ad1031
font_02_sfnt_off000165ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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