Malicious PDF — malware analysis report

Static analysis result for SHA-256 691e23c2a58d6760…

MALICIOUS

PDF

102.0 KB Created: 2021-07-03 07:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e94c49d865d0a1ba08c881446611e281 SHA-1: f227f7107b724d557655bb71a4a424a84ffd46d0 SHA-256: 691e23c2a58d67606add8a957b8599dbfb170d4f0ceff3f185d4f330673f1aed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. These links are likely intended to lead victims to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://awkontrakt.pl/ckfinder/userfiles/files/77361946879.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/18286215884.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/d6f328af5fae785e0717e2370f9744a9/2013350893.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/wirozevitab.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1e232e9222d2e68ab2d7807ca3b9f847/67374842258.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9f2d79d7d7c440c02d3504a8f6043de6/27891374459.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de02bc344a3---xipulogil.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090266b3a735---57201199130.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2b67ca2ee2cd34335a5a57db0c62da23/54847255380.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/6ff070c303a07b664ada1bb8345fa3b9/zenefurukodipajip.pdfIn PDF document text
    • http://skomi.ru/img/files/file/24388107425.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2f331789---kexovufozazowifakev.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/vipomatatewunufazutinike.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607791bd8f522---15801611800.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a6d0e754---32678311451.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/atltqkoj9iv6u2dpsgqf5crhq2/votivotagakuxuwup.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/mesetemejozad.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1d947389---86867092420.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/sifagidivagegijafubojase.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4cce646dbb0115e75e7f7fb5516b6001/96377383826.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/xilexogomabiz.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/feworakagexagaresakebifex.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a23ebe331cc08643d953a69aeb7034b5/komajipexexogudidupogoko.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/55787855859.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/88228481100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=superhombre+spanish+worksheet+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010876.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10876 18592 bytes
SHA-256: 8cd231ffcbebbec642514ccf78428d464e138e662b3e1f56dbec316eb9ab3635
font_01_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3B 10964 bytes
SHA-256: 937f3ee6df8973ae1b0ef2b2c0ca7731a1e4a6d4a45a2131a8fc1ae9c7a18d27
font_03_sfnt_off0001574e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574E 19384 bytes
SHA-256: 7fc9dbbb17b3dae5f6f10d28e9ebf702ec1877f0e1a8733f2956695d547cbf57

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