Malicious PDF — malware analysis report

Static analysis result for SHA-256 422943a3453a3264…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 12:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5581a9dfe2061d280664a472da4cf93 SHA-1: 3f27a8dff25c499bae10cf6c3890ef81af0d26e2 SHA-256: 422943a3453a32647bd72554b3f8d435f29431782014ddf096137b7a730b32c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+to+see+images+of+private+account+on+instagram PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nh718ds3qg5earhs9omre6jpai/57611833156.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613991e233531---gadudapafiz.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136b77a5ac04---takutifasifit.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/kesuxiriforawowutubokiguk.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/41553472841.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/61964034445.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/turejozakenevujuk.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/686504538d21ccc28ce1b114f21f5cec/nawijijo.pdfIn PDF document text
    • http://reichspfarrer.sk/file/64636105661.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ninokagapogefuvewajazu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d6f76bd8a8b62071752247bad812b172/70862312415.pdfIn PDF document text
    • http://wohingltd.com/userfiles/69752813194.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/zelivojitulubipimaja.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/60852180464.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mexezalixaneresitepewara.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/15885156615.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/tekupuzagivipo.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/junabokunuxutazitumi.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/74283884854.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/getelupuwiwivu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/30067974137.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/mukoreje.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/84173468188.pdfIn PDF document text
    • 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_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 11020 bytes
SHA-256: 201c884d705ab1e58af93b644198108b439fb12d56882b8bd2f740fd7fab3dfe
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 17936 bytes
SHA-256: 245e1e89c56d320369f85c7dca89ad7cf49aed0b72c2ecc330bc2082744ae393
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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