Malicious PDF — malware analysis report

Static analysis result for SHA-256 a455ebe033cedf78…

MALICIOUS

PDF

93.2 KB Created: 2021-08-26 13:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7a5ab47c999778e566430b3c7312d6da SHA-1: fe8b4538a71aad1aff81744cc05144ccaae8d714 SHA-256: a455ebe033cedf7825b4c49fd108f7e4a94519b054f5fc2956d09bd7048383b6
164 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. Embedded JavaScript was also detected, which could be used to facilitate redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://goldenagegroup.vip/userfiles/file/3879638566.pdf In PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608350b1bb5e1---38219020014.pdfIn PDF document text
    • http://hrudolf.com/userfiles/97937875666.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210817171253.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4a289ad1c0c4b9a65c1949aa1dad7c43/tajowetaguvapopotot.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/24802100353.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/98852203575.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/lupipezupibaleve.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/sitewan.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/80609055555.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/guzoguzapexulew.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/galoxoxela.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/17567042804.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbce33ab109bccd8fba13abd65e08ff7/85814749983.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/91558306186.pdfIn PDF document text
    • http://fitviewer.de/files/file/xonugularawibupur.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8476ac52---wejevikuz.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/58861994857.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/jubifesemabituxufoba.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/faloliverakava.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161070e5a6637a---82610080273.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/45468246871.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/64204581491.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a8973dc7---74123326802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tibiofemoral+and+patellofemoral+jointPDF link annotation
    • 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_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 17508 bytes
SHA-256: 0930a2f28605eef8a9a25bdf15ebeee6425e6b436c9e03afaa273eef14c0c7ba
font_01_sfnt_off00013fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB0 10724 bytes
SHA-256: fb5689276de9c36c45e07808e8adeeb92d7e745efbfb7bc7d798d5dd4f043bf1
font_02_sfnt_off000157fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1