Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1441b08ab7bded…

MALICIOUS

PDF

100.2 KB Created: 2021-09-06 13:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee98c3aec1a9c360918580073eb9ef80 SHA-1: fc5a92fd6421927377c0956860c12cc36d6aa9d4 SHA-256: dd1441b08ab7bded8aa18fc3fc63616ee6b7bf9631d1cc36370f5909e65d8b15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/59375919721.pdf In PDF document text
    • https://prestinieurope.ch/userfiles/files/58471457817.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0405ccd4f---96858320454.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/luxupomitodatagus.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/walejale.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/44728290884.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4c12208c---82718091977.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/18589029325.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9f34d1f0---97076199886.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16106610028fc3---takuvomumolawugenotig.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2498d024a---fukivowokufavozejirizunid.pdfIn PDF document text
    • https://epiphanych.com/images/file/wiwuzakag.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zotizobesigalabab.pdfIn PDF document text
    • http://ty-int.com/files/files/22169607352.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c27e4bbea---75886059050.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b53596fa6---70132883888.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/dikofazo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606deccd5140e---romusakuxaparalusodux.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/70925209458.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210723_104444.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2307a71e59142c3c608f8e2be29f9a7f/pojonoporenamuzetopotali.pdfIn PDF document text
    • http://fabtur.ru/upload/files/lutorafiwo.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/dufaromofodutegaxufafamit.pdfIn PDF document text
    • http://hidramaco.com/files/files/78212172508.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d42a65f6db---78902352028.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/26f7670edac825a2c0986f47952967a4/78592948327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=scholarly+articles+on+green+supply+chain+management+in+pdfPDF 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_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 11356 bytes
SHA-256: 3cc389a47c11ffec9d8c59d2ead6cb4a7851146af2b91d51f9ec89e67f5d43fc
font_01_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 18624 bytes
SHA-256: 314151e1503298da0dd9faa36b30c737741363cf5344f4056a27ff70bc10d5be
font_02_sfnt_off00016807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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