Malicious PDF — malware analysis report

Static analysis result for SHA-256 b218b4532fd135a0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 14:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 370a68ed6de7a0171ad77b2ae3161f86 SHA-1: 92538cf9bed6635418dbe96f597d8e2592ea123b SHA-256: b218b4532fd135a0b48f0466cfef277447965b8bc5262965dda08384570f707a
216 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm and a payment redirection lure, instructing users to change bank details or visit external URLs. While no scripts were extracted, the embedded URLs and the nature of the lures suggest it is designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=how+to+copy+contacts+from+phone+to+another+phone PDF link annotation
    • http://klhl.com/userfiles/file/nilakopok.pdfIn PDF document text
    • http://timebymtm.com/upload/files/resemawibadagoged.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6233b486---ramemiwod.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/29963149807.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/70900046696.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/defenilizaroguzagaxigar.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cad50e70e---nivexudebagew.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/zekidixukikopeveri.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/fonukujatekafetav.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/nesifanuxosekofiwewiziwo.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/91696501467.pdfIn PDF document text
    • http://vanhacollection.com/images/files/pojavosezepizetenasak.pdfIn PDF document text
    • http://bienbao.net/uploads/files/21936458431.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5221140f---92614813388.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/ginosunetoseweboli.pdfIn PDF document text
    • https://brs.jo/userfiles/files/7718122669.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/liwozunopedisakoxipisude.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/17129327244.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/8596023194.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/luxoka.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/xixamuvopefagadusol.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fevimuba.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nudiwunotajamanelosulomax.pdfIn PDF document text
    • 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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 10796 bytes
SHA-256: 3e8d7b7140dd972fa1afce165a16ed2f11148421a121793d6b1488885866f1b2
font_02_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 17856 bytes
SHA-256: ab50aff7dc505be517195ff2cd566a454823043ff93f5f59f9fce68c6d0a1b9e

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