Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31792de0d32ffa9…

MALICIOUS

PDF

83.4 KB Created: 2021-08-25 06:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39307250627ba76a0afc4d592551d7f7 SHA-1: 5b0e709ac62d41d749f68e4a12177ac5dbf81112 SHA-256: b31792de0d32ffa9fb81e59bfad67bfd1b8424bc1806cc9e53bf73ae5eeaf479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content or phishing pages. The use of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7eab759b6729f2ac88380082254a2908/87466713310.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f41befd6d24c0822e16c1ae93d5e394c/3204939479.pdfIn PDF document text
    • https://actorconseil.com/files/file/98892667506.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/92555713307.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/lijukene.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfbb8e0b00---82941284650.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507110257.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64970560139.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/41657390814.pdfIn PDF document text
    • http://plinoxotar.it/files_pagine/file/46447347039.pdfIn PDF document text
    • https://andrejc.si/files/file/15307783472.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4648a9dc5---93261361426.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gufowikelobejikaxuxafi.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/69449212609.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/donexabuxesakul.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/pazirugijagovimasef.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/lekeg.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727d532541---miwebudizifosaripoveriwes.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/57895415294.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448bdc2306---20190750182.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55ae1aaa0b---35705270088.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/44734132278.pdfIn PDF document text
    • https://biocoils.com/img/file/dujugumidoduxuzawavopel.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bujoditigekiv.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb6c42334f---85455900307.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/h5l6qkmk9cle8rp6esnk08ve91/nobekix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=95+divided+by+2PDF 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 17448 bytes
SHA-256: abc5ae96dfc356a33b382c146b2bd10383c5936c28b311c06439504d3d05cc3d
font_01_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 10088 bytes
SHA-256: 0951dd1e203618ea8f42d923959c115182f01feea049f4b26b7f3bd5e6e1fb2c
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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