Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d742157f3173bd…

MALICIOUS

PDF

79.2 KB Created: 2021-08-01 14:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03e4e462a1464f07b993d0e5ee1ec4d1 SHA-1: 5d17851fc416f4f0c531ba122f48b0c1579c3af0 SHA-256: f5d742157f3173bdde9eee4f2615ea9ca632f0b7671d96925f6fdaf4358fec39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://yongqingtech.com/d/files/gilijiriwatalugezixid.pdf In PDF document text
    • http://waterreducer.cn/d/files/79942103891.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/12172022513.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/360524606.pdfIn PDF document text
    • https://corghialberti.it/file/pekuzevipotafidotisiwivu.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/77029504771.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607590cd194dc---koses.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40cef5593a---mokenamadezepukifamekepa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rdcp5hmil5kedvu8u0js30ve07/ferifak.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ecad3f7ce---13184906264.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210703225421751.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5a6fd5a8135b4112cebc9a77e51c1947/xesilojuxemofak.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104b5eb0383d---vixebapefagam.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24385edb4b---vodazala.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e45fd2f2a1e56e6a9f2d6e082fb862ed/zanifakev.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/89021108260.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086774959ac9---totilukiziw.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ed7509287521f79d6a7ae33a98ac8c47/46229850226.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/13821272925.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/99066928555.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160e041e11e22b---29385694475.pdfIn PDF document text
    • https://kermanrooz.com/img/files/96831741499.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d022f00e3f---fivuseverixifokevabek.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/4625146897.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/doxeditituris.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cuantos+kilos+son+un+metro+cubico+de+tierraPDF 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_off0000cfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAA 17560 bytes
SHA-256: 604ede730fdeda46b84e9fe6d4e263c96302b9e4ec17d9682dca0c9baf8ebc12
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10896 bytes
SHA-256: 7ad8e73df223dc91f38f41960b572888b607e813393507d50e5e35fe54fdb2a8
font_02_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1