Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc761e440c5afd2…

MALICIOUS

PDF

105.4 KB Created: 2021-08-14 15:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60cb64401078c2fc6a05f1bd625ca5ed SHA-1: 1a5041f4e55badd0da23576e60dffab476f9f14f SHA-256: ecc761e440c5afd20e97e40ad24777c1cdbb97deada832644b9c40806ef9ba8e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 http://fujiya-burbank.com/uploads/files/55277012858.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/mopujiliwus.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/vakegag1sg9kt32mukksplefr6/webajoravemeguvus.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/75891174476.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/eb1e96c96a5e6008a03d57905c7ac035/wudufawev.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/3359226677.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0f57b777---65700797260.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14c704df8---nabobixevomakuxe.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/16977688935.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160773c7f28563---razibuwakotozezatin.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bfa7d9d39c0ef3a7980edd4fd89f4555/favulodes.pdfIn PDF document text
    • http://xsjprinter.com/d/files/10564459592.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef83817c5---56700903636.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991816c31e3---48599842009.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qrok3832qdd30emflsbnu1ik16/sipanik.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jajalax.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/652494ea4247fe7ad086284833179d6a/tonexagobawu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2d755dfdf91494e4274c4ecf5881fccb/74447387931.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5a44fd29---vovopuvizerisazutewitan.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/91096007ac6be5e6dc8c3e9cd8e139bc/16013140128.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/14621091106.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/potovitezakotuzuxolizafu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16107d4c620894---49883587940.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe1d0ecd1d---44598706451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+create+a+kpi+in+excelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 17064 bytes
SHA-256: ff8fb94014573cb14e1e37dfcf773561083d8fceab368518c65dd834ce4da08a
font_01_sfnt_off00015190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15190 10608 bytes
SHA-256: de807d7642995efbce53eae20525e78da736e4d5057ccc1706cdf7d6021e0dcd
font_02_sfnt_off000169e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E8 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00017f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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