Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78b49b00f6c78b6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 05:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: befcf30e96473acd577e6d05457d9c88 SHA-1: 380d858e1c1ea5209d1d9fb236fa30a0e1809d13 SHA-256: b78b49b00f6c78b665aaafae4addeb9e2500734fbe8d93164d0299c091ab78ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to numerous compromised websites and disposable hosting, likely to distribute further malicious content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pivotal-technologies.com/userfiles/file/mimam.pdf In PDF document text
    • http://sanzmendia.com/userfiles/files/jonuke.pdfIn PDF document text
    • http://sinostandards.net/upload/files/80533603811.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/xusofibojatugo.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/wanalugafesimarobipu.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/88748254240.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/66403737072.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/74160352885.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/19956560510.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/72301851393.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/54540046260.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16107ec459c1d2---roxarusuvivufuzilujizev.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b576b7763d---90790376090.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/55979601683.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d7555566c74f34f3947ab82f395f91a9/41005706502.pdfIn PDF document text
    • https://jotelek.hu/files/file/loguveriduwi.pdfIn PDF document text
    • http://canoeing.by/pics/files/96556681650.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/36523005128.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d767dd7b966e8254966cc18da3716f12/gujax.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/39166624694.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/19313246790.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/84b84c4aacb51dbd11166c7bb3d66128/27629420595.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/42233947143.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af78bea6d6e---mukomaken.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ebni4rqa3d60fd2ipre82qaea0/xarubatinenuzukarisunox.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jajedolurelaz.pdfIn PDF document text
    • http://allasclub.com/campannas/file/85312374927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+solute+solvent+and+solutionPDF 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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16788 bytes
SHA-256: d7297a27b93ee44df9bb73b91f9ede60dc51a13b6f91943de84e8235501f34b1
font_02_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 10588 bytes
SHA-256: b592789de985593d10b2ef4e9763def0cc2da0d3c89d117daf8fd4d6670bdbbf

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