Malicious PDF — malware analysis report

Static analysis result for SHA-256 3373b6592f6d6701…

MALICIOUS

PDF

104.5 KB Created: 2021-09-03 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d9a5be27c08c2501bdf653a481c6e3e4 SHA-1: 95fea7425c415dfb1105a1013805882571de4a56 SHA-256: 3373b6592f6d6701cc6d5ed2ae2112f66dd6ef9256895fc5afd4ec1815bef46e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score strongly suggest malicious intent. The primary goal appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607086a582ef7---xitukuxebomagolabat.pdf In PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/jatalakuxowemugofus.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/xubazu.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/65663582532.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/zajoja.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ebdf95d0072851e776aae898aa467d48/votuwogojuguwij.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/unkbnrc2olrb95qurkvicei64v/wuguvafe.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2te0u0c9n2r4vvsqj2cl0ou2r5/xalum.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/44de4fd19cfac788b24dafb77141e47c/xiguv.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0367ce82---95389585599.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/didulasogekifu.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/xigozenumugifo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zuwefododutitanijawag.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/15540545385.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078de4f0840e---bukubuzonubofividilum.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7326129d4.pdfIn PDF document text
    • http://chikatere.com/Upload/files/47234230327.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa78197b743---85675653976.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/84141315756.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/32753316279.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/54140890709.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160988b4002f9d---53968882986.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/56552042009.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0b59c48210a5e1c51f79c942c00438f1/xefora.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/nisoposilenedaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+reproductive+technology+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_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 10980 bytes
SHA-256: 8324d0ec421bdf9edc9bc182db675dd1d6a640db29884ddf8474401ee043d866
font_01_sfnt_off00014c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C93 18464 bytes
SHA-256: 0590d6fa68f6e2dba6cdf87804f51a9db3458d9c7dff0b09e958f94ccacfcacd
font_02_sfnt_off00017be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1