Malicious PDF — malware analysis report

Static analysis result for SHA-256 8057952fd035d3df…

MALICIOUS

PDF

91.6 KB Created: 2021-07-29 23:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3dda01de8d93020f1af1338fcd950fbb SHA-1: 07d466b72bb0113bd793f87a8b22c361cbe76cd6 SHA-256: 8057952fd035d3df48157af8eff1678417931ddff244d7a7afcc6fd5cd570653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. This pattern is commonly used to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://wastran.ru/uplcv?utm_term=gradable+and+non+gradable+adjectives+exercises PDF link annotation
    • http://www.celso.org/download/susajisiwoluteba.pdfIn PDF document text
    • https://kristinanamaste.eu/files/welovufajibosenizutevo.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4382b09bf61dd17a377b4b1e095cf023/54305486143.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/674ojdmvch5vet4n7p2nn2uaaf/2476807344.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210621_073239.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f86397574f6d9c0b012b0af5feebdc8/69656810021.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4a90851f---laditiva.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tagopo.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/11262318506.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/3e197872617fb1d6e062ce762812f392/77474667571.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8oqd4sfto5fp5uauf9pp58v9h1/60461097525.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/biwugolurusivivusepe.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kumopifuzoleto.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/31080015652.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9bc4d48b---74437351633.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/duxetuzavofuvuxenopuja.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/36854282964.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cee1d5076d2d8fe95c4164855939c64f/70353895142.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5seg8enp08h1rardp3bm1nt2i7/18432258908.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160749190983b9---rozibagigimalofow.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/116612aa916b179f5745d14c5fe7810f/45025856592.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad0816fcf---41191393007.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077710136447---58400103017.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844607dc531---lozixabe.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2e35cb9c186669ec51f3f82cdb6eba17/zatab.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 20476 bytes
SHA-256: f59ef27bbab0ee763dc78be810063f60a369577d29d1cc024c287a233d84f5f5
font_01_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 11020 bytes
SHA-256: 6ddc50e835d25f657a58ba08e5e52867028c1b3cd53dc21a6a115ddcc125cab0
font_02_sfnt_off000132ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADF 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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