Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52c1f891e229d97…

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 12:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3684683afd86dc42aeb58f26aec4fb8b SHA-1: 7fd7aa9d9df2ca84a50ba6c9bc7dcbd0897d7655 SHA-256: b52c1f891e229d97913230e271e5af19044341a43c10fd870c552d1e551eac41
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which appear to be hosted on compromised CMS platforms. This suggests the PDF is used to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://adria-ex.com/images/blog//file/37804723404.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/7pv8anqrjdqm99jbu0ndk77nst/34082061341.pdf
    • http://boxethai38.com/upload/file/52129639944.pdf
    • http://greenbrier101.com/userimages/setaf.pdf
    • http://kme-kme.cz/files/file/mimuretoda.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096794c4d92c---bupasugeveboge.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dfpl1hfq89akn6fmbqrp6dsstn/31851196852.pdf
    • http://axiomestates.com/userfiles/file/fobevefibugojasutirog.pdf
    • http://yuha.be/_files/file/32438491994.pdf
    • https://airbays.com/userfiles/file/95504433303.pdf
    • http://aryajob.com/user_upload/file/52339637709.pdf
    • https://stratasphere.online/userfiles/file/lodevodezasomatikazurajo.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/gekosetowa.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3873a837b6---tejosunog.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ce1b2acf0---65768201329.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/bikuzinajazalupobipivoxo.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/frq033uptjbugg7mqqos5o1e70/tubuxumijusebil.pdf
    • https://pasarantogeldua.com/contents//files/19738280595.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=magic+school+bus+in+the+haunted+house+worksheet
    • 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_off0000e789.bin
e15f1c9f5a7628ee4005a4b46e94fecf0b9d7c1e3ecd84a659e589c597643aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 11060 bytes
font_01_sfnt_off0001011f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 16792 bytes
font_02_sfnt_off00011931.bin
e0710dbdfe21eaa6d67fa87585de51485e3513716ae24ef8e38725592b65fe4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 17760 bytes

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