Malicious PDF — malware analysis report

Static analysis result for SHA-256 93031064cc6703f0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 02:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2267cccfbe3f9ff60b4593e451107acc SHA-1: 954b15418b834ab03bba092ddc846ec0df8055c5 SHA-256: 93031064cc6703f0934304d31415308760f242dbfbeb07efdb567d78c3b4b79a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mp-hd.de/data/aktualnosci_imgs/file/pewejanokajorufi.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614118371acaa---59751136899.pdfIn PDF document text
    • http://isosklo.cz/uploads/gojuw.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/soxojibuwanitovosovunon.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613979bd48d90---34458619836.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/89458247150.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/nulawilukufarosatume.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/29276569161.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://nedimgame.net/calisma2/files/uploads/nazoko.pdfIn PDF document text
    • https://laser123.com/geektic/files/58090704607.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/79739786249.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/musezisopuv.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/37137672950.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/48170641417.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xekumatunoxulitutumixabi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1e7c9c3a---32194820847.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/85f9652771d032ac5471874bb817bc36/tilokaxudezis.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/67805652501.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/66916174465.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/dupokoputu.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/jafibivekubovikegose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=prefixes+and+suffixes+exercises+with+answers+pdfPDF 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 18736 bytes
SHA-256: e358618ad9671202e0c33ec396f24bcd74ac532a1c4c0130507e14abcbd701d5
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 10840 bytes
SHA-256: c654f3a26b276157cb42032467042d7829cd8994ac6d12c8dba8cd5f1ccef44e
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1