Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd291761f4a4b6c8…

MALICIOUS

PDF

118.5 KB Created: 2021-06-25 20:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 502bbe9b7f1379a91aef2d44b14618a7 SHA-1: 2ce0c02675687d14ea186c32be58881a54ced580 SHA-256: dd291761f4a4b6c8787c533f70346c5835afb2972a40b82bbaff975e0874532a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and other domains, likely to facilitate phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4046c6810c---dojekimixamavowugo.pdf In PDF document text
    • https://pasarantogelsatu.com/contents//files/tubetekekuretamu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/aisnvser2d2rgofqmlgdvraqq3/36013561319.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/429c46bc350e99405bb95f9d7d00ee17/nagapovogofafupanon.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/8fe3e2f3d45e5538c74cd0b82864e1d1/dokoberojediniwipugu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/435ff11f5f2a480f526f2eb10ee5016d/40629300233.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fisusabigomaditukite.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/12181cac509c88d33a74d278eed48b13/pobose.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b6fb861b---didipu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096097d0f50e---guburivolijus.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4a3b67b4---68087255087.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc524deaf---zebokajided.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/25946698666.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42272b320---7983262765.pdfIn PDF document text
    • http://corporacionnoa.com/UserFiles/file/ravolaxetuzenatusate.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zaferulufomapemel.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a65150b7557---79944286439.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/dekume.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61893f897---10240514190.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10d522cb09---fixegikoxakekuwarusilef.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/7c3fb0144993085b3c18f740ae67f393/45758112552.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/74044420840.pdfIn PDF document text
    • http://allycatering.com/userfiles/17920036688.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bea460bc9---voneku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=anal+head+insertionPDF 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_off000172f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F5 10328 bytes
SHA-256: 111cffe195700d9b3e92e0d8fb77a7dd71770cfd69a1883070282d9eb10a9c14
font_01_sfnt_off00018a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A23F 16552 bytes
SHA-256: 0246186a09d04708d4851fa38be56cca9188a9097cf0ebc7d648f667957e8a75