Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ff07c9dd8c2d42…

MALICIOUS

PDF

90.6 KB Created: 2021-07-08 08:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e68809ee49902e4993a621767caaf037 SHA-1: 9d0fa809941c3c2e7f2a77bafec3e960f2dd784b SHA-256: 13ff07c9dd8c2d42531f390e4a913e697b2d01dff931a7bacd35dabad7ac8ebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a seemingly legitimate document to redirect them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://walkandsmile.com/userfiles/file/vuvuvorokodogezegux.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1v5dib0h7huv6pq4rshbfbr891/47497437966.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/nagivuwedafosususipefali.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/46261842217.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/dezivupafekebavomemuga.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/40684728184.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b8f664cad8c0574eec67ffd36533955c/1466622619.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/qnm7jl25tbarg6qu469vr61b9p/golopolifimugezojibin.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ehtg6mqmek3m8cpjofu6ti9qq0/wusodasurekajevenuwa.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f04c6e4c---4805290052.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0v9qge35oim87uk47humu37h85/46964591993.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/sajekagidag.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/40b0a4a15a7047faed92c02eb896a969/sijuzavodonirasazomivirol.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0c670ed56---87077077290.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/35107698883.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/pegatitimifebaja.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/fowos.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/70050963908.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/34118969402.pdfIn PDF document text
    • https://dm288.com/slicice/file/nidetojenijotila.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/9327269056.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/cq875advh64e25r9eu837g7a47/79089972758.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/0243fdd501535b5b9eae63423525522f/kawazabigojufudagi.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/zigelotugo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/35fugut2oi55pmc8qnmolh6v82/pezepikapifimuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=malayalam+general+knowledge+questions+and+answersPDF 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_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 11124 bytes
SHA-256: 129a18dc5f4954f26b3ea50d7388db8e00bd3346d36f69f7a38f03dd835fb787
font_02_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 17624 bytes
SHA-256: e626e682b6064b276c7df46075c1d826bace13d89a3578293ca0852f9a49e536