Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a5172dd36b9799…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 17:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 759dab9948d8fdcd38088f607195da9b SHA-1: ff1c68177fb2fde70956027314fc1edebfd8d660 SHA-256: 07a5172dd36b9799de6d0c39182e3a5031c8e9e13188aac241b7bdd743fa962a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate it's likely used as a lure, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ed15a085cf32bf775528f74f4972aa38/nubavetogajotifegele.pdf In PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/12179045939.pdfIn PDF document text
    • https://rm-parketi.si/uploads/gilojimadubalorasivewanut.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1449e2c556cb50145d26b366d347bdb0/ligexowefi.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/luniwanubaxegasixopevosis.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d672d61a---28178168374.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc552fb6dae---1505777638.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4b30gv68917va45u4967c0k8dp/jibonig.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e33a9f76d---zopoxivuzopinuwezi.pdfIn PDF document text
    • https://grancom.by/upload/docs/pinadenoge.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/tefujepokebewizimunegoto.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wepevoraxobuvemose.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/59912158627.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/pazajezufuxoge.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7ca70fa6---jaxosarakejatovilatipor.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/rewuxitegulafidavomowa.pdfIn PDF document text
    • http://allycatering.com/userfiles/12068200823.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/6d56e9b4329a0eef0b1c4acd18669340/92074279139.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b646063d19d8c25c78ee2fcb0b5c52b6/duxamawimenu.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/jixewixabopemumatig.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/93555369849.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/pezebemud.pdfIn PDF document text
    • http://ijfbn.com/editor_up/85748338202.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/90876128995.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nuxup.pdfIn PDF document text
    • http://airfa.it/userfiles/file/5282672552.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/21714915b7b21bf3055233ac48adeb8d/31271097334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=silicon+controlled+rectifier+experiment+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_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 10628 bytes
SHA-256: cbfb702dc0005373e10e720eecdaac8c2235a537c3847043be6db7484977af05
font_01_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 20116 bytes
SHA-256: 3ab40d625cc2f09b3b7d23ee6472a8befb67ead1faf79807bf79af43670b255b

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