Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16352af95cc441a…

MALICIOUS

PDF

85.7 KB Created: 2021-07-19 12:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01869b0fe36d7064001fcd1ffd000325 SHA-1: aedda4196d46c6379e48763cc14a475be45da08d SHA-256: d16352af95cc441a1fd00b18aba66a72d9ecb20bd0b7da35d11730babbdecc70
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body is unreadable, but the heuristic firings suggest the primary function is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nwatchonline.org/userfiles/file/rafabiwifemenudob.pdf In PDF document text
    • http://studiogaleazzo.eu/userfiles/files/28049084591.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf841c3b9---30782900948.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608456c3648b0---90732438729.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57aa4236b5---77589927856.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aabde1be8---xefawitutore.pdfIn PDF document text
    • http://fittbike.hu/files/file/fesiremovarumigazaloza.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6ee5d0c4---1893978877.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/be416670e75eb02732a97a259c1f5e1a/20697742138.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e361b3aec---koxizonorob.pdfIn PDF document text
    • https://werbemittelag.chupload/file/48290911937.pdfIn PDF document text
    • http://adveotec.com/img/file/xozikemuzuzevifut.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d236160---28222529616.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jj2j07p0adgf8peansi9rtb690/70625511592.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d74ddb1c0c47771b312405d28f2130b0/56100646262.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0c701314---temenisosavetakuzabukulog.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jesupeludipetipozezili.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0088c26f---wanugefanujilino.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/47350316912.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fa1e1a0f09f0001fa4d06c2aa179130e/vosefera.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1276c2b5---fusawiberusozasamudewaso.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/63aac909c368574d55f2475288497ba0/3907584254.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/57423003385.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/gebivixodabi.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/nagogulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wishes+for+marriage+anniversary+for+sisterPDF 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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 16416 bytes
SHA-256: c2a2f44d27dd7ac8dabb1c5a7b059120fb51fc4cfa23fd6febfda7102b9b7cd1
font_02_sfnt_off00013060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13060 10788 bytes
SHA-256: 53b2b11c8dc1780770b9fc985ab8d0fce1c899a1aa0d7f909dce6c2cfc770bdd

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