Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ca56f81a6a3ef5…

MALICIOUS

PDF

91.8 KB Created: 2021-07-24 06:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 55f4d455721198b23284755698c780e9 SHA-1: 58793efee6b85ebfdc5683fc6b4718ccbc018e4b SHA-256: a9ca56f81a6a3ef5bf7b445ecdb2fdceaf469dfd810068562be6b7d7b432fcd1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://a-kamen.com/userfiles/file/83074351792.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ulivhnfuobeu9qk595b0ajk3b0/28012971241.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/87549392202.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63ecc37b4---52396915899.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/bonojakaravixelina.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/zifuxaraduxola.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dbhn2mpg2pu5pjrvjbc1isgl92/61816067873.pdfIn PDF document text
    • https://banghenails.com/upload/file/warerewove.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/60rqfqr0olegnv6a3c7tsnaa61/59472460623.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2b57a6a19b065bb2a77185296646291b/86138722652.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea4841b29---pudopeguxukotinujijasizes.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/1af5fe264d417aba3fd30295d5b7c301/87969967930.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb8bc10a44---vezoreg.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1231036510c196d072e4318097a752a9/15498718114.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df250333c---bunamubesowafo.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/rufazudo.pdfIn PDF document text
    • http://drtamerturan.com/file/xoloturifo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761390c4a1c---58021667983.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/97fce59a574ed69658494c3dc2349ed6/49177051958.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/5acd47e448ccee9434e0d846d12a4402/mitolavomo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2685685285.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/buginepepizedixusen.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/83201bf954effe88ea8a0b20dd40d67c/9566806524.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/49149195603.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/45057d5b6ce12b843a5911cc47574ccc/fenezemanuvipaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hibbeler+mechanics+of+materials+10thPDF 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_007_off00013c4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C4E 20388 bytes
SHA-256: dd74f70c39d24fe3271f8a16c5917cf616d628306a313a9d4e328026cbe5613c
font_00_sfnt_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 10904 bytes
SHA-256: 0df094540e87461ad6febb5e7beccd0d0cbcb3d47680759c0c94bbf9e15b19d4
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 18844 bytes
SHA-256: d0964b413a880ee9b065ce6f0a25943b02b0c9f79b17f38739a6809560bf6064
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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