Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff71675655f37ee4…

MALICIOUS

PDF

84.6 KB Created: 2021-07-04 07:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 503f7e50c91e3b0f9a8f677a5868c6d0 SHA-1: 4784df64a3fb4fee99aa2217815ba7a716cf14e0 SHA-256: ff71675655f37ee4d9246b785e5eb318fc090633b7299cdf983e4cc067956015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pistant.ru/uplcv?utm_term=how+to+print+from+ipad+without+airprint+printer PDF link annotation
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608105ad99728---tubufurezojititorumupolew.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/jafilonujelezaru.pdfIn PDF document text
    • http://www.toptehnik.si/images/88241996942.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/uq1bl6msd1bi5jurhuieq5ed4d/kitedewazalinatokuzu.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/f338cm3ghcfadojpme9eq5ujrm/25048213011.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/090dde3b32b1cd17259e3b940e6324f8/17672038259.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5aehd6dle13v530t5p78evvfrb/52642982185.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7cuom1v23et8ktpd4621141u68/26205716869.pdfIn PDF document text
    • https://samudra99.com/contents//files/56713266094.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/30056653836.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01ee32e86---gobebapawuvakalavikibiviw.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607780236df32---12351698580.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9a1299bd944c2fde725351bc803cf3fe/legowogegizumuralunadiko.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dfh291e1ceqv4vglpkvnls1gi5/kutekimokefudubel.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/89237c6da4f55255f81a53fd41305f7d/14136640374.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56173e781---78545360526.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/sinarubimipig.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9d887ba8fc2ab130b4f25e24fba58945/83263056718.pdfIn PDF document text
    • https://papiratisk.cz/soubory/puzixajabonizizekibamumo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/19629027594.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f487v7opklvth35qldmt6pcquu/daloxukilumi.pdfIn PDF document text
    • https://nada70.org/userfiles/file/63919548626.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a336745b79d---xawiviruvesofowomazogigob.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_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 17068 bytes
SHA-256: cfef8d9e395eeca4fa7adc7d05c62f298d133ee812eb4e347e561255f4c9f4d5
font_01_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 10724 bytes
SHA-256: 62a3b22cb13c56d5ac4c16b8aa0ac89e6e2c09888f9d4418815e762d1b12ec2f
font_02_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1