Malicious PDF — malware analysis report

Static analysis result for SHA-256 759dc63b858bb38e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 15:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0ca7b529ad1947234047aa7fea5eb98 SHA-1: eaf6440effaf1cb5a77e30afbef07415ff86f0ca SHA-256: 759dc63b858bb38e7aede6ef0552424d8204a69e6888a9807d93ab55ce1e457f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=last+known+location+of+android+phone PDF link annotation
    • http://dostrojar.sk/UserFiles/file/6471658546.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/9894811372.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-10/20210910122857680853.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/bavipiwinaxam.pdfIn PDF document text
    • http://banquat.com/userfiles/files/46161722792.pdfIn PDF document text
    • http://sbairs.com/datas/files/sapun.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/6087902361.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc916bc3f---22746028313.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/wuvenawabeniresolumiti.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/6473610831.pdfIn PDF document text
    • http://webursitet.org/Files/file/varofefasivifo.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/zuxoxugodepofuka.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rifabiwigov.pdfIn PDF document text
    • http://apismorava.eu/docs/fulexejara.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/56346455225.pdfIn PDF document text
    • https://pratham.one/file/jatilevuvitoxaxi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b3724a1bd---topug.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f75d2f9b---84316653736.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/69257199984.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/safadowawoji.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/tozirubazetixaj.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210922232849.pdfIn PDF document text
    • http://expresskaliski.info/file/vawumelonix.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/gimewododenax.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/99250973009.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_off0000b22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22B 14496 bytes
SHA-256: a9f3b8daef229f1befbdfcf935d0b9c53bb5673655d51e1332d680b57d739c6d
font_01_sfnt_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 10852 bytes
SHA-256: 3ab7c909b6129be38c1a3eeea2d3a9d81d97d77d59cf63e0d33e32fbf82bc1bc
font_02_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1