Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb03b643df504a4…

MALICIOUS

PDF

91.1 KB Created: 2021-09-21 06:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33d37de2b2670f6523f706ae849c2ead SHA-1: cd2ca19c572ae9ca1194847ecf02cba8a028d1cb SHA-256: 7bb03b643df504a4c0e22dbb2b2969d1de794ec00ea293c79f147fb57463dfec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious or phishing websites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4hvhdhncbac7femocf3a1rgedj/mesuditixifum.pdf In PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/99680724330.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/xirixevokurijepatopebikas.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/37911539342.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/249272c7de7a5ea500f4f64cc1518db5/70699069301.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/kanefimupuw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/881rv3c0ru851mlmck73f284d0/rusokawezetujiti.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/todefaxalunatizoji.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/90143007153.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/14718729429.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/zudegegopomawudobupi.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/67683195256.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/zipufixazedizakizisuzom.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/82278449544.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/tekesanexisutewodidepipa.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/pidiluwesuvabitodinazo.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/texararikubufa.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/75377058264.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/40560180428.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/nededomitola.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210911171555.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/16453713923.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/movetolugemujepewowo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5d84d46de54ee5c0c91667e13c863da8/ranulukudujobopozo.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/48057731478.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/68351858535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=where+to+buy+music+on+androidPDF 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_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10936 bytes
SHA-256: a21537d3c249033bdf6b0dd16b91c318febaf89c88134aaf97a63a2460e0fd5c
font_01_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 17628 bytes
SHA-256: db1f76527f36d5df09ccfa994f9537a7aba69fd3c4bb0c64a63ebf56ff4eab19
font_02_sfnt_off000146ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1