Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faba6d64613be89…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 19:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7b866a5699d2f7499359b14972645f3f SHA-1: 9c3a569a8550350fd2963e64a4d74c63fa0d266b SHA-256: 5faba6d64613be89819295bddf29da5d9a1dc35e2beb6770151e0b0cc5a64ac5
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 CMS upload storage or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves directing users to external malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=plants+vs+zombies+3+mod+apk PDF link annotation
    • http://tantex.org/tantex/tantexuserfiles/file/19875105962.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75488193907.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/21162666057.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/taxidowibonexopefudidenut.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/niwimexidubifu.pdfIn PDF document text
    • https://ivanamihic.com/files/61166176065.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/56202850186.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/91495534812.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/wowaxudixojejezokamisisok.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/zijizesilimopos.pdfIn PDF document text
    • http://lex.tj/img/file/59598935627.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/57d88095a33677e93e805438654b24e5/77576806797.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/jelikidivazositu.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/botukax.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/xevoxosoradituboma.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/18030972391.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/27808429114.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8b166938---gojapuwarapowovakoter.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350dde789e4---79719120847.pdfIn PDF document text
    • https://gilbertems.com/videos/file/92561256517.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/56113464854.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/rapabofol.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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 10984 bytes
SHA-256: 319d1f12c0b311f5b95c98bb560b33b800eb47a8132567f1b7c434794cd44df8
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 18280 bytes
SHA-256: 258c7491b1abd564360cda5e80d5dd3e6b5e7ba60ad5307b93c97f007cd2572c
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1