Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2c445fe3ab91ee…

MALICIOUS

PDF

92.6 KB Created: 2021-09-04 11:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec9826128dde5686130e2390552b08eb SHA-1: a93f702acc2eb73d8d8a7e50fc86a3841481ad0d SHA-256: 9f2c445fe3ab91ee36bcb4559486f07347a46d61ff9cbce16bdbede4b288c55f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/6rnjonirb54jh871bcq7pi0hn1/domipetogarevitevoma.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161060a808e0d0---24073065048.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3b92cd41---37887448674.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf5d9a50b---32340000794.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/725f9abd2f90e9ec86ae9d7b13848b19/fukozasuwumodoxe.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/44719046449.pdfIn PDF document text
    • http://darstin.com/userfiles/files/86191197202.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fafudowafata.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072820762a35---65136755536.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8890ab59516c699b076f2dd7cf10bbae/29953086505.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/pijidedux.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/repumidivamivajebanajos.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/36c94f5c0ec4aabb0b3afc73a614b307/jamebezifav.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hvag3ph2tbkfddh89ukentkl04/godekuj.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/23744540677.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609032ec7e21c---66167039369.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/puxulupirasumibixedanelux.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/vilam.pdfIn PDF document text
    • https://maturana.cl/upload/file/20652175082.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/51612294245.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b318e0c4dab---34968839721.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910449090a9---87028684660.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ce9eef964fb750406b4b7bb49d4b9ed5/7223175872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=oman+prometric+questions+and+answers+pdf+for+nursesPDF 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_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 19152 bytes
SHA-256: fe4c8934968d627320d8b8c139778f7641f07ba94bdcc1ce30b547d8be8dc740
font_02_sfnt_off00014ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD1 11092 bytes
SHA-256: e5394ab61fd7eb1d7a3a1d4c6b4a6b935e69dd4cd75d196ef032dc239535bed1

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