Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65fba116980ed62…

MALICIOUS

PDF

95.8 KB Created: 2021-09-13 17:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11b78095bc012540c2fc733cf0619048 SHA-1: 5794fd01a0d17090c88b75e4db139e3215dddc8b SHA-256: a65fba116980ed62850b8e0dc22518d15b0a6ac7497443ef9c4c6afac2eba289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://crewmak.ru/uplcv?utm_term=skate+3+apk PDF link annotation
    • http://russia-ex.com/images/blog/file/27052465983.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/78624660986.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/65537913790.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec24a0cb5---pabovil.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/93413425683.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/pibotetewevoxigepow.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/vutoroperinojajenokirun.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/70599417870.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161362d5a2df96---98363233302.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911215514843075.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/xagupewox.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/16488157424.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/99653610185.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/sozozawi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/zevitunev.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/pusikuranopojeritomok.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2d4ed3b2---dakiz.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/21091202470159141498967.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/djg30nph78emgvj56go9o4q63t/migikazanekixavirobag.pdfIn PDF document text
    • https://chv.vn/userfiles/file/48201884321.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/95215957061.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/73243078204.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/88816356217.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/31584157260.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 23920 bytes
SHA-256: d12454bcc8ed76be289114562c6c04d783943f5a546252ac4054f81a2198c6c3
font_01_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 9952 bytes
SHA-256: efe666b59495ebe47f5e1344dbb022fb45a18f44e7351db8d98ed848f0a9af35
font_02_sfnt_off00013abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000142b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC9 16348 bytes
SHA-256: d1ded3b69e59b93fc09cb216df6953a727ad2dfdbc6c6630cdf5a66aa95d8000

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