Malicious PDF — malware analysis report

Static analysis result for SHA-256 b869128fd116e27b…

MALICIOUS

PDF

79.0 KB Created: 2021-10-06 09:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14bd543d229c5de48870a9f36a8f7181 SHA-1: a95886e1b2f666c81d91f4cba6414b71e412459e SHA-256: b869128fd116e27ba000d86e3e4bc0c267f64db00db44d58ea472e9a164b4b96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt. The presence of embedded JavaScript, though not directly analyzed for malicious content, is often used in PDF exploits to redirect users or download further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4676

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
  • 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 https://synerhu.ru/uplcv?utm_term=remote+android+from+pc+via+wifi PDF link annotation
    • http://bielle-srl.com/userfiles/files/49829887353.pdfIn PDF document text
    • http://mdtrend.hu/files/file/xubela.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/92673396742.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zetitigix.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161303ea5cc38f---77338910333.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/76637328306.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/90497756928.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/83394055900.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b605534a6a---17672692577.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/80448281276.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/fivolapalawuvudorukefazot.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/nesiwefupenexi.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1454ee65206178037e4fd1eb57e5bb2f/2586566427.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/96379155388.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/lojiminetasodu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4ec3095c---94512757692.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bb4633bba6---rijopateguter.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371533852e2---85103882858.pdfIn PDF document text
    • http://www.pvvc.cz/files/72539505391.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/37549454713.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/76006466298.pdfIn PDF document text
    • http://schokofontaenen.de/idata/defiwuzafuzajukopa.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210924073347.pdfIn PDF document text
    • http://platcometals.com/images/file/texejutorotabi.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/bosevovuvuvutupe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb2d98c7ba---71892333410.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/23222290013.pdfIn 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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 10764 bytes
SHA-256: a4da1aafa1352f07fc5322a0ee088db41a54bf89bd497fada4b7ca88260a5ac2
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 18040 bytes
SHA-256: 93af8a09cc0bb0a6b89cc1e378ce08ef55fe615db34f38c0fd4ff7946e2df4a3