Malicious PDF — malware analysis report

Static analysis result for SHA-256 52eb3e430d2be49a…

MALICIOUS

PDF

111.0 KB Created: 2021-07-16 01:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2aa31f0878fb74221eaef92b4de939b1 SHA-1: a1d3b36fbaa9e03b5de79418b085ddc523d6b12b SHA-256: 52eb3e430d2be49a69530ac9f0e944508acc2bce5016e35f58d105c285ecee35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://svetplus.com/userfiles/files/daxotewibit.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160773f6de6ec1---29515980329.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/54t1b663mlrm8kqnrjfc1nm44e/fufunan.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/jolibezafozawuroxazalipo.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/fb6027eb96efd8c92a7800bb6864e973/dider.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/s998gin8dedgod2tc4tgek9avi/87541844767.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/44suv3pipnu8bttpd5ccjc3pq7/69019164356.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/30056004963.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0ec67943---92890244590.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/81373560773.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1c8cfc07dfabcf0ff93afc74695224d5/nolexufozubesofotisolede.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/gixukiwif.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afc08aabf4f33a23a49da8a501bc8f11/buxufikusipalulowomoju.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/acfdfcebad8aa59a1d4d6aa47a5e5487/94869405689.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c24624e0af446207974a9afc3f16ae27/63370365648.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/77323242596.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/porunajim.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ecf3418ac12472f94d98a77f1e7455c1/60746593068.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/tidonafowaxemiwejokide.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/68964204294.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/faluluvotamusimon.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa8a0e5d53---lunaziroligajupad.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7c8bc98ce6ee3f827e81c5971182fe57/93888153164.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/64185964153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+convert+mixed+fraction+into+improperPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off00015382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B99 10812 bytes
SHA-256: f465de0e4c313efde1b0dd7f439ff08c46bc9a217953165132fb156ccb5e3671
font_02_sfnt_off0001848a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1848A 18472 bytes
SHA-256: 08f128f95957a37e0b40b53f5765dc73bb815858f9d13fe60095f6e199f127b9

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