Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaca685690b2e55…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 16:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61fb267b81a1fb27a38d8701657d4cda SHA-1: 35d7eec6a85f1cca5a3dc3b0b27fcb3c5315ef02 SHA-256: fbaca685690b2e55db1274592f2128c0dcac43b4fd3d5bfb3c379ee25063ecab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting sites, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://moveworldtogether.com/datas/files/77741246494.pdf In PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/movasuli.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/benetupel.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/lopik.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/9961126103.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/54976105407.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bqc1avcnbkckodtjucp238goab/rinudaxibejoketunuxozoguw.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/94784336070.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdc943e3e4---72798137126.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/zutuvixegalof.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd625c5252---72956791432.pdfIn PDF document text
    • https://scalping.ir/data/files/file/41370681948.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/zinisow.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/nezopolusoti.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/91cdb0e7d96cbc563c892ef34c956e7f/nomoxesotep.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zazomenej.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161156119b564d---57590556809.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8e9a067a---13582023569.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/64uhfa6l51gqiv3aro34s757c9/40823123426.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741c1fdd114---30507261034.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1f322e77---40883911151.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/34133313679.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/lomekar.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/tuvomezobowowenuwer.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/kidagu.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/tivez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=english+easy+story+book+pdfPDF 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_off0000b816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB816 11108 bytes
SHA-256: db5e270b4585c91d10062a7b6512743a7ab8f120cd64a29b92c3a5ae626bd214
font_01_sfnt_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 15624 bytes
SHA-256: 82703e00016ea055cf7d45dd7b1b2f4d61dbac2cd358652bf505df968bfbc5f1
font_02_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1