Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78c301a3d3cbbcf…

MALICIOUS

PDF

91.2 KB Created: 2021-07-16 20:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed9c5d360ca0a7fda366673e92489da9 SHA-1: fc981c0c5a78fe685c94ac862e0f14535b558dd5 SHA-256: f78c301a3d3cbbcf86c9bfa05159e17ed07cd6484f89eb58780abdf9c43fceac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/9443500ae7b61b0f37604772a91366ef/72431876459.pdf In PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/0d479def57c556647f048deabdf8de9b/voluvabibukorovezuvo.pdfIn PDF document text
    • http://safarang.com/basefile/files/81326909980.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d4753e52a507217639bf10b0a73c057f/kewazawoboxiga.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/foninozaro.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c60023b4b7f---79013804314.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89eab141a---44509027597.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/dinimopiwogiwusiwikobon.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/widekiranuwega.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6eb470ff64b69da524254d157733703b/susofuwaxopok.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/hm6o6u4sqnah4l56qfkmbtr6ce/39963422092.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/45cac580724cd2015d0e190dcae2b3cf/tajuz.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/29515877357.pdfIn PDF document text
    • https://adikketiga.com/contents//files/83782214131.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/da65155d19593432e977d9195bba16bb/59282609563.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d74eba2ff1---dapanisagarij.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/golajavanasujowuvusebol.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/jezelapazetipuguruzer.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9fd99f4cdc5a0bfa1447c35604cc42ab/bagavokepapuriwif.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/luondmht4m0u5utu2m23v71buq/bibejiw.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8e661015---jamozamal.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/122460813ca48ae17073c1c4f1b582b5/65651107362.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e3093813fc8fe84a94c83ae67996365b/69105944525.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b944b7b37---xuvikikatemolukubake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=marital+counseling+definitionPDF 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_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10744 bytes
SHA-256: 3bca469b229ca72e86a73891f4a2a8d4e99cb65c8e3b6c8af2b5a115a9d9ce34
font_01_sfnt_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B5 16636 bytes
SHA-256: f1d33aa7186e358a137fe4b77f23b9c2a8613cc058b06431e33b1591095190fd

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