Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b9b360e855d4bb…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 05:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81c9ffb1b16b7f054d399a4119074436 SHA-1: a572ef6d016aeb2b6b76f0a213bd4a726e226487 SHA-256: d8b9b360e855d4bbf43d7b341e824a2cabfd9b76294b75556dc484198a9f92d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to phishing sites. Several heuristics indicate the PDF is part of a link farm, likely intended to host or distribute malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://mopron.ru/upload/files/94317857411.pdf In PDF document text
    • http://czernavendeghaz.hu/admin1/file/bujegizalijokeginedijof.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145cf2c0db72---tojufowibepakigedenebenav.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7a2109e75772ddbbd1608cfbe49d761/safamojureru.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/daxoripitasunurag.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rubibibuninodipagitu.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/94360572213.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/jebisudezofa.pdfIn PDF document text
    • https://somogyplusz.hu/files/64606512024.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/32690581383.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/wexosaxibisudotu.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/wukoxowiwu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/67780788066.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/10443615011.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/72171427160.pdfIn PDF document text
    • http://sushibelovo.ru/files/safaxawotu.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/dunijedakipifixekis.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/miwukidekepufudabujujujav.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/rosafusisodexe.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/lapalokubogikoxadu.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/88862567450.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/41e8f736f404271647f3d0ce673db8e3/gipadafukajewavikagawabiw.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/kaporuzenotorofozikanux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wps+wifi+connect+apkPDF 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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A8 10496 bytes
SHA-256: 9622145dcd7ba69839e11e5b67406c1359601b3d6c5639fce7d486d6d8fccc4f
font_02_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16440 bytes
SHA-256: 69c62bec15838015c970858c8e4f65a019f04256207f25e35d872e531e00175d

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