Malicious PDF — malware analysis report

Static analysis result for SHA-256 669a050b69db7bd7…

MALICIOUS

PDF

91.1 KB Created: 2021-08-03 06:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa9919eeb1883879545e9e57e7169869 SHA-1: b058ecb2b53b5a298a04b39bc2971026bb57a1da SHA-256: 669a050b69db7bd70d96f7c8870239c9cd27ee4a7b6dcf82e95485585923b315
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=ejercicios+de+asientos+contables+simples+pdf PDF link annotation
    • https://centrorevisionimonregalese.it/file/zumudejilowegu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3afb086d2---85875961980.pdfIn PDF document text
    • http://primaneighbors.com/userimages/21542629307.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/85504172336.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/labusizike.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/tugamekopumixegowufawu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/ruveranazomirizoj.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/xarugamewujemurudanubumeg.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c225ee65ffee0ab2621a5e1ad4da56c4/18662589865.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pakariwowonutoj.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ce196656---38278864069.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef8f19d5c---91939010896.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/i9llruhapgubu72vupnr8ccftd/vufafajiwalawoxusibapuni.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832045de2c7---12413348139.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/57279688822.pdfIn PDF document text
    • http://lukinserv.hu/file/bojodebavefomawokiliwo.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/zositaro.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/dbf1d752e155a55c8f9d4f4a6684c7f6/jixuvukilul.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/lunubi.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/26444843994.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9a36a605634fdec545a4951ae0dc3a53/duletavira.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/lokisuso.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a03906ef45d---nizoditiforumesosalivawi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9e1d35ae5---xunali.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 11032 bytes
SHA-256: b3aa100699592ea278aa77570a8ccb49c2a4675806f180571381698cffc60d92
font_01_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 18900 bytes
SHA-256: 0abee5aa0f49258f54a42fc870d9f6edb728a9454b40d48a95464f7ccd634956
font_02_sfnt_off00014470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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