Malicious PDF — malware analysis report

Static analysis result for SHA-256 55459c22d58a0e76…

MALICIOUS

PDF

88.4 KB Created: 2021-07-04 06:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d2fa6f071bf6e7a9d2a7667e5ea3c8f7 SHA-1: afed7fefabeb69abd3cc8dfde2eb88e600075ab1 SHA-256: 55459c22d58a0e76819253b9e32671f0ce866c41b304ec1a6f7fd4a2cab7167d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://chcial.ru/uplcv?utm_term=forex+leaders+signals PDF link annotation
    • https://al-farh-iq.com/upload/userfiles/file/mugimetoroxupiwoviwaxaw.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b4d381e893119976ffe1df27776278bd/wozumodowujena.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/sepakedepifexevupivola.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47370093481.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/14679936907.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/15843909311.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/wezisinuse.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093acd19047a---kepanar.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/44f8216f0bf6d458939fc4e59e499f1d/35032597892.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f90cdf3eb5---bogojowojixowaxawevufopur.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/joxivesasarajuzekukozexap.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/pewivorubamogitizaro.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7210d92c68---felikojize.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/6533833704.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2d4557b920274466b04e0c6961b3bb83/74062083922.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/foxapinavuxigude.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/61202565253.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/89020188619.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a006f2be29b5b074eae480183e589479/zudumirek.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b21095d09cd---pexofa.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/biwapozasodad.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/38860970929.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c199e9e145e---xelinovixesakoxusibowof.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/98625124600.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gumonomifupavavapukomos.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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 17236 bytes
SHA-256: 8b356dce92aa6064cac2d1647e742457f6a3e664e5997c10d24ffb7ea85e5b27
font_01_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 10404 bytes
SHA-256: e3d8ac13c7e009794f89b9e6129ea29dee88cc2a75871ac68bfc766b75bb4f92

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