Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d70ff66b833dda9…

MALICIOUS

PDF

101.8 KB Created: 2021-09-01 04:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 240c8fc532e5f65bda4248d40870f4c7 SHA-1: 3c891217678a57a8be949b4d2c7fa3f236a44db5 SHA-256: 8d70ff66b833dda9da318ba8b946a5e1561ecfb8f546045cb27689311d465730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fotofidelity.cz/userfiles/file/tininifidavidodofad.pdf In PDF document text
    • http://pcwenhua.com/uploadimg/file/16265422701823345726.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/tireliwivume.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/59209865576.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e750f4a0e9589e7620a01b89d09dcf2/7361837719.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2nroq5a4e722ocad5pcrqngcif/83184707741.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/totagijifewatu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/44035593258.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/56798470269.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/87628730795.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c048bec2dfe---11196955367.pdfIn PDF document text
    • https://aedwea.com/upload/foto/57464425329.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/38942933356.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/xakes.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/70533063127.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/19161085032.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/riwuwik.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vfvv268l7i3gi6or9c3ma59uul/rupaperegeruwegokoxediz.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/lugugiv.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/gafubikolega.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/66497182463.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/59175515236.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/89124082822.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/busoxopubofudisavesula.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/72937877812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sully+and+mike+and+booPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 25280 bytes
SHA-256: 4711272bf991370fe7f7a9ef027ae4b908dfbc38bd16e954ec468728739730ae
font_01_sfnt_off00014127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001593e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593E 10564 bytes
SHA-256: 733712a55970356b401c2a2ab70e1bf63c74118254e961293cd4864702ff528a
font_03_sfnt_off00017148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17148 16752 bytes
SHA-256: 734733a53e0d3a4a7558d8119855acf2061ab063d137c6421abb9a1f1e0228d5

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