Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f22f922554cd01…

MALICIOUS

PDF

90.5 KB Created: 2021-08-01 10:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 327c360efcea9f1188b7436751f71e25 SHA-1: 116800b9b54dcd69a8689badb567ba87660793e3 SHA-256: 71f22f922554cd01573b0a9b7fb44c8db4c9b97232d902e9f1ccda777a88583a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://relatives-united.com/clients/75139/File/41822855944.pdf In PDF document text
    • https://bisnismedsos.com/userfiles/file/dezikuxemodupejuda.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/48531108094.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc5a3044d---63651474604.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6559f36a---xetepetixulam.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/63731236973.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/nabokedobenuniw.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/fiwim.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c6a594e11544bc7c7a8cfbde46308900/nudujatupirer.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160784c03b859e---48792171675.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/98143244214.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/nadusinegexugi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d75f2a739c831d27622178cd4fbc1940/90491239831.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/zuvebegamub.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nogexogixamapanoxapawutu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082310b0c0e0---korugopifatobowexon.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/75112477699.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nalenuribo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7c934277c21fbce8ca04aebb1abb017e/7006599210.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/93738665924.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160900ef7ca9a7---99733210322.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/mekiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+recover+pictures+after+factory+reset+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_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 10924 bytes
SHA-256: fae6a24fde38ead0650e91a2a70ac7571941960eec78e32adcda4f8712d5975b
font_02_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 17816 bytes
SHA-256: 165af2f0bef945a7b4123125c8c2b6e9eb7163767ee54538f7ca502d91f9abdd

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