Malicious PDF — malware analysis report

Static analysis result for SHA-256 0395c901eb84f70d…

MALICIOUS

PDF

90.6 KB Created: 2021-08-17 20:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 207a6a1695cd1470afdc6df693ba9346 SHA-1: b5b9f131f07857009ee27a86f8b473faa48b44c0 SHA-256: 0395c901eb84f70d1f504a639cb2754f8d4aabb78deec2d8839da0f380a66849
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being the use of malicious links within a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=cuantos+bloques+entran+en+un+metro+cuadrado
    • http://winfielddeli.com/ckfinder/userfiles/files/tolarebuk.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/godov.pdf
    • https://appvid.eus/userfiles/files/kezagugapuziki.pdf
    • https://abofahed.com/userfiles/file/nojonagatisukinawu.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f4h82r2l7kr7msl8jt0hrsd5r8/fanowabo.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160973b606cf6c---12826505244.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/087748fa1804dcd7ad454e6117d354fc/denakereler.pdf
    • http://owv-sad.de/userfiles/files/23104463943.pdf
    • http://boek.se/bilder_umeny/File/543288593.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7828d6a56e1be3487e334d6c425dc200/56765457229.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0758dbc6ff8fd916971003158c35b28/57185093770.pdf
    • https://vestol.bg/files/file/fikisijitokafixakufub.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/882ea9f356989e6e9137918296b6835e/25861874552.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7430b6f49---xaxafudu.pdf
    • http://benevolo.it/userfiles/files/69472458497.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608488f2a4f21---zafabolusetozotetalasageb.pdf
    • https://www.retake.dk/ckfinder/userfiles/files/56139628897.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d566e00ca8d02c0db5ed81252b5734c4/diner.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16099f70407bc9---78359854193.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866ad956a6---kiwon.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fab3fe4ebc35ea236eb4e7c5fee7a15b/99945238102.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deaf.bin
1abad0e582bd4fe89dbc21a14d4be0a89c88aae3793517d151d40d918fbb7756
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16416 bytes
font_01_sfnt_off0000f4e7.bin
aaff5a8d6d1710d3528fd339f349e092ac65c6f3afdb8534d0c1d18da86bca02
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10856 bytes
font_02_sfnt_off00010dd6.bin
cd855df1e5ac248538774b5793bbfaa5aab1db8b55ebf62ef4464bf861e27875
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 20740 bytes
font_03_sfnt_off00014188.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14188 16792 bytes