Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa255f4525806d8a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 10:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0380a75263169945eef717213611077a SHA-1: 5a17f9f940d5a76c6690824a727fe59329e3d48c SHA-256: fa255f4525806d8a785cd95d3a628bdb24f28bdb9f88feff520baf488e2a1667
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/9r7ok869o8n33vih33hf88k4ph/foxinututesozenekaruvut.pdf In PDF document text
    • http://mpti.ru/userfiles/file/moxisaginobaz.pdfIn PDF document text
    • https://adikkedua.com/contents//files/86901236181.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/suminif.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/sofunefikogokabuju.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/wolasosexap.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/nulajorubodexolowedolo.pdfIn PDF document text
    • http://iwort.de/userfiles/file/mawuguponek.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/dulisagogogugiwefavox.pdfIn PDF document text
    • http://erex.hu/upload/file/74274711933.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/74abb0952979ae1761d728a77c020284/80347046613.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/sonedagajumibivogupu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ae3edc7d4fb38a1d7374187b8169b3c1/48414654783.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae30db2d10a---rozadisuvexuwaxiri.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/kaleri.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/51354532599.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/konojovavowo.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/26748980499.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/75805619121.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1en4qaege137gou4gqpq3pjh75/61853243580.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/40862366287.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bfcf5ad8550---vipizovamaxaxe.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fb55cb7814705f087bb64784c4a38853/desebotezalabevevek.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4549dd7f6a3ed57b19f4da8e9bd40c03/radixoruzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wd+my+cloud+ex2100+user+manualPDF 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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 17852 bytes
SHA-256: 56af48f2d2478fc8c5c1fe0b6fe5182b1c51cc84ea8d33271ad60272b0550efa
font_01_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 10944 bytes
SHA-256: c2d94fe4b5786fb4635aa8a6bbe3033d6889aba9068d4c8be88b4265b06f38af
font_02_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1