Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07962c79d9e0c10…

MALICIOUS

PDF

86.7 KB Created: 2021-07-05 02:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a151218f1564ec4dee1b0a68362ac91 SHA-1: c425da93140797f39121b1ad9e2ec118788cedf4 SHA-256: f07962c79d9e0c1085303079423a44001f357fba298df9f08349ea8c7a9a3760
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, which in turn host other PDFs. This behavior is indicative of a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ahq66s46b5gdovtcsih2q4rm7i/kelusovalosivifinamigesa.pdf In PDF document text
    • https://schmitz.cz/res/file/86427800606.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c348b94e8f4---nuzuwujan.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/klh77fdmicsrhdpp9k72omg3v5/95482770245.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/muleganasom.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/48d21b7d0951421b24300f6baa9db9a3/71967137676.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/t0kfprhtkinnfaa1gbdbuab3gp/6341410609.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/l4a6vmri0p3ushj65lq2svrhne/87034285545.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/473d3d3df1702debf6360dc205bf5d3d/gakegaviluxejuvuba.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/17a51e0aa00b3e68969fd18fb373844d/kosafini.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/37614692462.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bd3738e1---jalijuzisewo.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/701501e8f06308ec55f7e0c5d6c6135f/9538776368.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/61036959650.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da03467467f---3379356990.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2aa85b6a2---jojus.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0f10f445ea820418daab0fb2e09cf948/wuvenobinafuzevi.pdfIn PDF document text
    • http://asustainable.com/global/file/fowowavovijepunudo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/53058912194.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3a4dabd95e6e0fc7e7876627f06887dc/nalaxu.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/6081327098.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c53ec1c3071---75232364915.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/68492254788.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tfs6uvo8dk9niqj8rgk31o4a46/43758149002.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a90d12f29fbf2ae0c7e5359158f0510f/55930415283.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8886a62ee---8695592641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=albumin+is+used+forPDF link annotation
    • 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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 10476 bytes
SHA-256: 42d8ca7c455ee725043eadcb06e1ec605a52611e331cab26d791999089343520
font_02_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 17660 bytes
SHA-256: 07ddbfcc384d8ddcf546c65d5dd77d6d4dd0f30cd3252cec79ba59752a443d39