Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba8ecda7bbd241b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 16:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4aae19d7f202a22a3130b78ac6613932 SHA-1: da81b0fa28f7a6068b6da946707fba619f7a80e1 SHA-256: dba8ecda7bbd241bf17a1eaf47c3af7452d67e8555ea408ea2d48018bcdbc143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute or host malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign, likely leveraging spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://balaji-technology.com/userfiles/file/vokezoja.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608365e7038a2---ralirujorixitenonunabed.pdfIn PDF document text
    • http://bptramptour.pl/files/file/43810563035.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/22289670580.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/84d356d47e140e7b00ec9f87fafdebfd/legujoxajulakitokinelod.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/90476032832.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/30757691424.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/kuwufaxufuzumotakowiwoje.pdfIn PDF document text
    • https://red-adlay.com/upload/files/pomerunadozutetewil.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/rezokivorevelugepisi.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/20412532508.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baec0349507---16346608148.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f2508b6a7---wutimudes.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fibebfctaq6s5jma31kc5od87p/koxazutewapuzubudidobe.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/81264346116.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/78818904985.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2908c46d5---3070893743.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/867957475.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/62da5ef031fa3e8013aa9785ab440be8/61576115048.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f2daab787b833baf4c3d984cdb02acf7/vidapaxevimeg.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/noragebawelenuremagibe.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/11517611921.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/34506408454.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/50124670663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=map+of+usa+cities+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_off0000cbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 10456 bytes
SHA-256: 26f16fd444f3e618340499bfd510efbb600783899e56d4a88e7d85287b250a33
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 18184 bytes
SHA-256: f9885d3865ca8546af30bdb3c3b4a5318c1eeaa2b94f9b8bb84b858e8256bc03
font_02_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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