Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99727f201bb9d64…

MALICIOUS

PDF

90.2 KB Created: 2021-08-06 15:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0aeb4e1a93b3d7d07f66643ed83a177 SHA-1: e1a1efc6bd5cb10c520a850e23c41e0d93be99ec SHA-256: b99727f201bb9d64427670c67eb729000f96c515575b4ad8cf535faae4c06c80
164 Risk Score

Malware Insights

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

The PDF document contains a link farm hosted on multiple compromised websites, designed to trick the user into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the presence of numerous external links and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic suggest the document's primary function is to facilitate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/41725971076.pdf In PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/gijazavonifopuzev.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/fupatun.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/5478179993.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2fe7c4a64---jexitulajamodogatod.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f093ee9ffa---roratipo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/57b687e15962851e2b68243dd620ab72/gumoj.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3da585429f06c18e02faa6a8b96fa800/zelufulezerijo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417a45f58b---guwugoxufomed.pdfIn PDF document text
    • http://nktrading.qa/file/files/nukopuwaminuv.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e6931faef---zofugisoz.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/77663235136.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/fozativorukax.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/benoramidixefajakuvaw.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/94134144933.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/muxapifijegerodomawut.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210616_38D4BB4306CBE368.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/jebazatugeradinovet.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/kowizosokidagabu.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/88766966786.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77ac0a58e---29702508092.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/l851ec7vb2695pg5g6q8sqrqs1/11185095551.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/9vf5c75jvanlpokahlnp6okea3/butarijajerigexokan.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/47c73566532b2d6bd19a5b335701a19c/81694472829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+play+terraforming+mars+soloPDF 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_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 10892 bytes
SHA-256: dbd35db398c0e595c0b0c184c7f0f1589f3b59d937566bff0e7c3c4c32e8f469
font_02_sfnt_off00012ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE9 17580 bytes
SHA-256: 72f24a88700914234621b842cb3f563659e4e2d8e4722b34743ac3670fb45f33

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