Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b60f790fb99755…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 08:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02f7ebee22eee434a9e5c80068e6f37f SHA-1: 29a3a271dda52b6f7172e3c1ab211c83077e6aa3 SHA-256: 87b60f790fb997555a205ea3580b93bad101701c6d10df4e0fd170864b0804c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous unknown URLs strongly supports a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/mixubutivejewememomeri.pdf In PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/10271832263.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/25800170711.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/4ddnd3232p2r4prn11t03aopg5/wopusisedegob.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/43818026431.pdfIn PDF document text
    • http://renknh.com/ckupload/files/milibufavuvudeki.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/cde8d6b19cf7978801d2694db7e9484f/60602603613.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/zaxelosuzuzewawotofeloto.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hehgnc3pkak80vo1qud1mg19na/xoperazadaj.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed03dbfc9---xakagobarabitojepakusa.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xivox.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/91244736777.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/74abb0952979ae1761d728a77c020284/80347046613.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/nuxude.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a642f67615---73763608263.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/621ralh2beqmvfsf47uuklksr8/tejodovanupibe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xokabosetewofotat.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/p7j8ltcc2ur3tf3kepqiofmnj4/26206131215.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m4ptc87f0jvilekpts33cj49o3/32719945568.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9668f14acdd3c4cf64d97327e5df800f/mabasomu.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/kolipudiro.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2edfcb3427---16164661996.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/k3t8kd98pamnr2f98pilunmfls/sigepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=iifym+diet+pdfPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 18260 bytes
SHA-256: 51d95e394b3909cf0f60a21d25201b5e36a9b5a82e377c312f23db3bb91b5c9f
font_01_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 10024 bytes
SHA-256: 214025fc5ca14fd0a2a0f846d4f4fac8289f90411a847a062bd75b3ba4368073

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