Malicious PDF — malware analysis report

Static analysis result for SHA-256 582800f844c1eac3…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 10:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ffd9739bd742f0ccf92b928837f9171f SHA-1: 2e1945dc6799dc19fb44f9a559f612341cf0fe02 SHA-256: 582800f844c1eac30ae9a6e77c05f26a6245e94d613eb25a53620bb2ed83817c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing sites or download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=states+of+matter+worksheet+high+school+answers PDF link annotation
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/b281v64qrpgdrr0dgge77h2692/lodejawotizajomuf.pdfIn PDF document text
    • https://aokman-drive.com/d/files/reregaw.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/70554834874.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f17275f5c70ab416e79663ff0fe35c12/5480465425.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/85985200459.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/rofavafo.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/66544370612.pdfIn PDF document text
    • http://bdsductri.com/upload/files/95973749347.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/11509804056.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2aa687e8adc588c569e1eb2c6fce3671/73236913203.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba063d50f30---37122286165.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/ketuxuxun.pdfIn PDF document text
    • http://geose.ru/userfiles/file/duguvimilalanoresutuxekok.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/24924398183.pdfIn PDF document text
    • http://deauville.ru/files/file/41177172532.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/60206550913.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970d26e9791---moniwetirijupik.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607433e9c06a8---45274012100.pdfIn PDF document text
    • http://atya.eu/files/file/94812885355.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac781a7e9c1---zumepofevamok.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/49410520408.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nadadifa.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_off0000cb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 17652 bytes
SHA-256: e5052b2bac1a772a087266831dd1cc2ec18a3a8a90782f2b9e135bf7c883859b
font_01_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 11036 bytes
SHA-256: 442fff9e2218bebbd40d8df98e2b147e4810e3462234e8bc3680ebd6b397e93e
font_02_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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