Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf6112a3e075def…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 16:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06090950b9151a51f365a07786f102de SHA-1: 9141a92df32f34c6e64e0545151357f81ed8101a SHA-256: fbf6112a3e075def9826cb22b9438525d594afaa6252b3b70d749a7d2e33dc57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of multiple distinct hosts and the use of UTM parameters further support its role in a coordinated malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://nomylo.ru/uplcv?utm_term=dc+and+stipe
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77e8597a6---57688464650.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a4d113aee---zofodofanetekusezumewo.pdf
    • http://kalikraft.com/images/file/31416951570.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9d38191d---bajegatamosejopibiro.pdf
    • http://irk-yoga.ru/upload/files/kodezaro.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/31641858061.pdf
    • http://bioident.pl/photos_fck/file/vikawigupekixofamu.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fe4e2681---futojejilaf.pdf
    • http://beijingxinzhi.com/userfiles/file/20210507012658_2000095228.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff577d226---38779261660.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/no48q81hjmk5l5jl1t79vk01vg/murarefogususukebav.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac51bff2d---wobowaxegipopegisu.pdf
    • https://addsfly.com/userfiles/file/42046842625.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7fe1489db---xusonaguwuzenuwaz.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770a385064e---79549428174.pdf
    • https://responsible-tourism-alliance.com/content_file/files/seboniwifemirawabos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb78.bin
c26520a4aebc9d7c6df358e7e24c77c258305e5fd01d0ddabeaf3845a77a4ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 10244 bytes
font_01_sfnt_off000102a3.bin
3b7c387b51fffef5c9c15f30b189a21638bda1596d4bf2c5cd10a1c76b28f127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16780 bytes
font_02_sfnt_off00012e04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 16792 bytes

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