Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b0eeab12bfa21c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 16:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a62b068dee5a5957b72d9bdb6d35687 SHA-1: f9ea7cf1d6fcde245512d123cce6a23bea23b37a SHA-256: 74b0eeab12bfa21ca4a5be4f04c2b445503adfe2f83b4e125b5ef5d91336d85e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://irlanc.ru/uplcv?utm_term=frascold+compressor+manual PDF link annotation
    • http://ehomeforeclosure.org/images/file/fudaximukabapefubebo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c9dae4c169n13h70u8heeuiui0/nibaborolifulaxa.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/65855366580.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/52cf7273c92a54aee29f66b3457514f7/sidowowojajidogenazi.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/1582950910.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611e54fc0a083---sogagagodebijonuvoguroku.pdfIn PDF document text
    • http://byecook.com/ckupload/files/30366731481.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/luwekarumu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69e70fcb1---19863370194.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/44888793167.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/29122145143.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/75300ec5864825548a15bc70c6061a80/bikipapimezepege.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/451mums2a1hlnpinejd9r7l3p0/panameferanafidebemip.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55be240a2---4521969107.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/wejekapuwalejirefapi.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/72314727452.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e1d7a6a5f---79102660939.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/45218676128.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/08a5416ce225192644884c6396c8fbd3/26858654048.pdfIn PDF document text
    • http://denge.aero/upload/files/80813971849.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/78878811144.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/kexepiwezaseg.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c123742fc7e.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/fewigadopufu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/92a1f90af03c6cae22f496f0638c21cc/xexafudanafozije.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/fabiromovitejepi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0836183905---65516332538.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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 17120 bytes
SHA-256: 381a9eddc71e03d01365b8230ca97fc73e932a43989f251d8bcf573efdeda0a2
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 10560 bytes
SHA-256: 48f2289aaab825e9caa9dd4994c86ce64e2ddeb43ce5982f0b67a0a2a589edfb
font_02_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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