Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71e1b594ef56f63…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 18:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f5a1e43d4270cbdc435c8eb0560fa30 SHA-1: eb913a5b81a3cbd1ad37079d82059980bf3bb7d2 SHA-256: d71e1b594ef56f633980ef0ffe4d5c457c435adaf37f005aee10b5290b51d5ff
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0abbea8d---fadenetevi.pdf In PDF document text
    • http://tortsurprise.ru/upload/redactor/files/modizituk.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e9bed978---woruro.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/90fe538453d3a00dbb260a51b7beeaf9/68299970559.pdfIn PDF document text
    • http://domplus.su/userfiles/files/38250840753.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5v03uut5mac1b48mtq1dgdktmq/xegitov.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///vesobenawalajavenugudak.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8d6615802f2b061e6656c113032cb77b/37618530816.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a221a200617---17377924035.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/4b7fbbafd7622fb67f4fd68666a8deaf/37694327640.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/93024658097.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/30171e65ca8bde17d798acc19f47db57/xojapasuw.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/karoxomigota.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/208c4d14a848cbb7442868de740546c8/mimami.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fe06ff92dd79539472a4f10cf47c6ca5/74064255710.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a18848a5127---debofapanewabalopu.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/tadofurojuvufefotisubike.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/78592873407.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f75546cbe0---zofukudizovolopinevi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ef821802ae912d72d50f80f31ba63d46/zoteniladoxijuguditupe.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c15af69a01e5687556f459e764043d47/defipinotepika.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/88044378899.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/efb7396c414657a531781d8b2d46ef58/86630701962.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/42486788409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+backhand+in+tennisPDF 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_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 16304 bytes
SHA-256: adec79dd3d40849b03065f36b0cef5cd3ac3964ed3ad11157e180391e65631bf
font_01_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 10488 bytes
SHA-256: 83743b0c0ca27206c7aee0ec2c85d9129f5f28af014e583134d6a85222ccd11b
font_02_sfnt_off00012d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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