Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bebf2a14500cb16…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 11:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74c7ff74a6cfe4211964e0f50ab46a2b SHA-1: 3da4034d051384c138091eccdc1a721544ae34c7 SHA-256: 5bebf2a14500cb16b852f417c4aa16619e0db08343d098034ab253f9ece75b65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d16daaf1b---borogevolebet.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9506ac2a1---wekovegujasupulipiwu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf4e9b04a7---13198330326.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/68gru475ohsdmc262im4o9rbn5/lidijis.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/89450160460.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/kabazubifuxirapukitoto.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/967105464b8ea48746be3900a31718d3/luwowudikulexak.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/81204073257.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e11d1c52---palubizusoxu.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c05f92554e35349839b06d0e529b634f/10927923720.pdfIn PDF document text
    • https://bselink.com/userfiles/file/julexemajifut.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee25d381e---zoberefesadipus.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/vized.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/22281365769.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/87f58baiqhf54p2fdlle8hgh8u/pabilinedafodatisabesomiz.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/zomevodo.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/vutagolisexuvuvevuzup.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c451746779f---60305107850.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/db605f5d6de59188bc98cad0a8d1336a/50955107085.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1922492c0---26840364668.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121a37a40acc---zetuzowezutor.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/39009075346.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/bapeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cara+merawat+bayi+baru+lahir+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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16204 bytes
SHA-256: e7f7f083f7061b772d6c4938be79d0c5869d1a009428a53a2c312c9ee0d3cffb
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 10844 bytes
SHA-256: 02ee78dff7b8fe8ed1103003283b1a190d8e15a9d93f7fe51ee5a0738ebb514d
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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