Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09167bedaa1baf3…

MALICIOUS

PDF

132.7 KB Created: 2021-07-23 01:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16684d401ee0b00a38c9773db1d732cc SHA-1: 436d394f1795ed352e36e243da0d4c747a23a7d5 SHA-256: b09167bedaa1baf3103670f97ffd6368fee5ba846216937ce4a4eca25fe310ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content or phishing pages. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

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.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8a5eed23---sojatafelugoxuzumesi.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/sowanutufolomanivamivisij.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/winepavirarusekikedutigid.pdfIn PDF document text
    • https://maclashoes.it/file/43478321152.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/disolanozematikazideka.pdfIn PDF document text
    • https://scriptdd.com/_file/file/93565744768.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4c64f0c7fa3b344912d57af075ba1a85/53874107274.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/sesuvupevu.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/vozuvitifumoruxiwum.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/65612037888.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca8e03ee9---33390962893.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/vuzorobugurafebezuvitoru.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/r55jq2gagnqojbn45mniqg0h42/remewekana.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18a2dd1ac---jorara.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/23808700633.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/34c987a208a161c7adcfb3294f372216/58625445889.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/961cec6de9fd1adb52d6bf15c5b5d478/16248443247.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/golidosag.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/27016217384.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c35bad902d26df94388559c72f7ce9bc/busubebew.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/66407920119.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c39ca547bf7bb07903a797900cbb586d/biladawere.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/fojeroba.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zimavogiv.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bebd2b5d34---39042326544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=real+horror+placesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DC8 10224 bytes
SHA-256: 5122a477870c4dca66f22504696cddd7cb177824b365bcf9a0307bf7fc425a4d
font_01_sfnt_off000194d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194D7 23560 bytes
SHA-256: a2463ca3fa38f84982e78d1db0812a899a99df19625fa4a72845df3a7920cebd
font_02_sfnt_off0001cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E42E 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_04_sfnt_off0001f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F93A 2604 bytes
SHA-256: 45814525561a22e662fb065768644e7e0ae8d5945ce31094470918f36d602fa3

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