Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f9cedacbf2b1d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 06:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0021333254da1b3bcb86511c61ee5ff SHA-1: 86940a02ae1cd038e0be5f35b554f06c00be81ed SHA-256: a71f9cedacbf2b1ddcf7ebf8d226e44cd52d6ca2c5806003cc446f9e3da8de53
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on potentially untrustworthy sites, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and a link farm structure strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://classykitchen.pl/web/uploads/files/kobapawufumerudebufi.pdf In PDF document text
    • https://cottonweb.net/userfiles/file/xezal.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad1768b61---91049736625.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/51406610769.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/42030346866.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210718_8EF66021E2A8460F.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7ce1f91a59ac635bda6435eb6af2ca9d/jobubamar.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/desipodad.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/89997783649.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d823d3340---galipobumuv.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff55651d7---94369282278.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/gexowugisupijunuxedud.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ca3ae968---66491191314.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb772e5c6b---nodigexewimiguv.pdfIn PDF document text
    • https://ekransamara.ru/files/xakafinuxata.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/a7e95b9ad3acf6240928e918bfe7e317.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9022436b98---54560223059.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mesozimanabobotikuxasib.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/jekibevafesinu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160967b979fed0---8316605128.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/kudefidipitujebem.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fa56d5ffb---fugovukavuvowifa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/mosixupepowi.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/jejunokakibafeb.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/15775238558.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/59202420223.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/910c8039e79a4fb0cb773fc40eed8269/kerifolepofasenuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=php+book+for+beginners+pdfPDF 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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 10704 bytes
SHA-256: bdad28fab0b2c8498e59e157eaea6f7ac2d233752ffb6ea52cf462f29f52feff
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 17852 bytes
SHA-256: 8ba86ccb4f9057f5c80bf9eb6ad0acf90a1786e7068bc453e8f0eb9dbba447ec
font_02_sfnt_off00012c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.