Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b053290d574309…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 22:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41f48e2e11d3ad9b09c687c984e301ef SHA-1: a19520ebe9c71cf13a6632b479bdbc96f3471c1a SHA-256: 89b053290d574309e553bc34bfd07737a63b8c8adb614fe8b20a12538436edf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document's structure suggests it is a link farm, with numerous URLs pointing to potentially compromised websites, likely serving as a lure for phishing or malware distribution. The presence of invoice or payment language further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lorofilmes.com/Uploads/ckfinder/userfiles/files/mupifukademelusexetuxuw.pdf In PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/butazodobuxuwobez.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/17886327364.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/kerurukimanefotokupog.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/4012451222.pdfIn PDF document text
    • https://uudanbury.life/files/file/56572272981.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///fadululijuwi.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/30617292806.pdfIn PDF document text
    • http://learningkey.org/userfiles/83479024537.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ab972894074c3d339c5d2daf6b52d176/gebawawafajisuzasebo.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/gisoxokexilejupaj.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160785c2e76b98---vewokabavawurutatozow.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/taluwitoluvonato.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f289802d5---tozuwuligotivewuwozatowuk.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/22359757329.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/42764151720.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/biviwozif.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/32d2e39ac0769b6bd03f7c7bd9f98632/jubuzez.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/wuwanefimuxinafuxiv.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/62658068289.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/f034df7161b11531f3ff543faccc9107/fagobojodemonuwobudite.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5ff448c4a57770088b29b5aaf6e4b425/20326429532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tally+solutions+gst+notes+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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10748 bytes
SHA-256: 9cf4ed07c3b8ea5e97f9c7e393eee01eb9b60f0828d2659cde7e713853e919e1
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 17848 bytes
SHA-256: 4f266b45d5a07b831f4df2cbd1992be417b625622ede3a5fa2476ca2f4bdff39

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