Malicious PDF — malware analysis report

Static analysis result for SHA-256 be766e9ee781bb15…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 10:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ac9daaeb338771a284f4af36a41f7ac SHA-1: f73a8ea0cf28b857243e686d15702dbd947d912d SHA-256: be766e9ee781bb15cd242e4335c1fa76a12bbb73c147cfe8993dd137a34d5156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://giovanniseneca.eu/userfiles/files/92357465826.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/ziwubabizelivazukozizulev.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/pabajufebusiwiva.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5652b2f812e9f3d9fb9e7d173d722a4f/wifanuwinotirofobu.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/5ea7f294345121db97e96e3ee7e44bac/81143856216.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jpbtv6maahslvu5kcp1p2kmco7/nazivapelapuzag.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/96893817427.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/drmnvolj7v06phi6c1mh48cl5j/24201989072.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/tifavibakosaveteboba.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/73348700159.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/34091842650.pdfIn PDF document text
    • http://bptramptour.pl/files/file/68003484307.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/foleretogutikejiwozimiraz.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/75778953713.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cdeb9df620917a0638298cf48556fa30/96115849040.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/82304119276.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/68008722289.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7398f394b4485470d99cb246002eef57/wetujakisipaxaroxazipera.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/gomujuzasusixuwerujojamo.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/baxivubakamiweloro.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc94065fdc---folozujalupivifojobu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ea49c199---megavipimogudomosusofude.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e3108055f8d0b38dd00e1f7b5ffd5fb3/33860163315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ukuran+fertilitas+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_off0000c10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10D 17080 bytes
SHA-256: 1e5bcf22b4d8bc79689a1752bf6165c9878704984a0d34e1362e34c36a1651da
font_01_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 10572 bytes
SHA-256: 85e93931355362a4e697dc1ef9968f5609281f12b5f67afc724cd6dc0bcfd0eb