Malicious PDF — malware analysis report

Static analysis result for SHA-256 306239342cc46aa6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 22:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 891cce4e8ccacb87d46cb3fe3a5e1471 SHA-1: cee6c7565e8bbd7b0b05d44533ac797ea493ce8b SHA-256: 306239342cc46aa65bf9060f96ad16af9f711dd1fedee50d2a2983b4e47bbc1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting. These elements suggest the document is designed to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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
  • 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://krisoc.ru/uplcv?utm_term=manual+usuario+peugeot+208+signature PDF link annotation
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/b8745b6eb37a6bedbc0697b32c03dd09/48893324221.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/41470577796.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5nfguhbj4u1l5cf2hpv0gog40/45236791980.pdfIn PDF document text
    • http://ausafe.net/images/art/files/84970501211.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b615d65bee8---21273493895.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/pisipatigebopomeminipanu.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/67622066564.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210816154559.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gemudab.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/28940418405.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2a5585173f87a13dddf6c70cce280a6c/gifofofizateritovetuk.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161159bd8eaf2e---78833495043.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/97701969299.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/68392324857.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/divag.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464cd6ed73---voruzedarukifovex.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b185044a2---sobuvaleturadege.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/lijesulevusepesazizeletu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/338cca38b9c1354134c0347bc924bd09/zawefesuxivukovelagoz.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9s5rul49veak3hlfo3mc0scbc9/kakeduj.pdfIn PDF document text
    • https://nevisnews.com/userfiles/vasuwibowarokujiviwozug.pdfIn PDF document text
    • 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_off0000c726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC726 10972 bytes
SHA-256: 798f30725f25c0b50d7e5f9aac599e2b006e6d393232a70985f9f1981b0df1a3
font_01_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 18580 bytes
SHA-256: cf64a98fa2619736e4be1fd933b9355a0befb016b9dc1e2ccf1ef0fb522a4c5d