Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e381bb6c60cf4f2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 23:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 550c08d65bd7ec162c0ca9b04315c187 SHA-1: ad45513a56f90e7e0f1e6190ca23d3b66547062b SHA-256: 9e381bb6c60cf4f221d60b9bf22d29ed43f63f03f5cf7c43e38d42253c20f442
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains. This behavior is characteristic of a link farm designed to redirect users to potentially malicious content, such as phishing pages or malware downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=god+of+war+1+damon+ps2+download PDF link annotation
    • https://dongciao.com/uploads/files/202109122231258652.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/noxolog.pdfPDF link annotation
    • http://nexxosrealty.com/userfiles/files/netujoboxafunadepo.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/63318019332.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/35580115220.pdfIn PDF document text
    • http://machulski.com/public/file/visebogowukareralix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489673dc639---64125535874.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2usrqlm8m6ki74ho748ejgoevm/merozekizi.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/tuxerubosubidobivu.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/69988037819.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dezoverefunovizonaman.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/056c833a392b4064f001eefff2f5613e/bujolexedepabudo.pdfIn PDF document text
    • https://aromamarketing.md/img/files/luwapuzejuzuvajivilulop.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/69797516929.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-12-19-15-45-99.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/ponasusokisikutabimidawol.pdfIn PDF document text
    • http://specialcats.nl/media/files/rixigipavubijimapepuvolod.pdfIn PDF document text
    • http://umhouses.com/uploads/files/zegekerugusupu.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/rudexupebadat.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qh5s3ala7ga11sevurcsn6lvlc/70171413989.pdfIn PDF document text
    • https://ever-progress.com/upload/files/giramiget.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d878a85c---kavinetevodugutemogo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380851e1953---55438938910.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/dojixonenarifejafakotino.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143da98184d1---nizalagaxi.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/zibemositasa.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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 18196 bytes
SHA-256: b5eac3faeccd6805656d2081fd8b1c88b0411695c6faaf40c49e71e76a19b5b5
font_01_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 10636 bytes
SHA-256: 5318e3de4de7d98aa6a017c31e63c6a0a0f035bbbd093fdd7ee62d0d0d45a4f6
font_02_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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