Malicious PDF — malware analysis report

Static analysis result for SHA-256 818f9d486fd57738…

MALICIOUS

PDF

94.7 KB Created: 2021-07-14 05:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2c445f9fd79d4d2a938d40dbf896871 SHA-1: 8cd563c5f8eaf9d6ace2751fb0c491e66ad8b863 SHA-256: 818f9d486fd577384a13cdcf4e5fe55298ff08f27c3dc7ec4938c13c4d31bf8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=verb+tenses+exercises+multiple+choice PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae79878861a---puwim.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/govuzidekexekipejugekukil.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da8c82b0793---44741072935.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65df744c7---88663499885.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a354c11d6fb---28097969637.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/22bdee574e5c16b29f95ead62cf2bf00/tobafazogupej.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/47702359274.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdcf625509---57206407318.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf13333ce---5377107708.pdfIn PDF document text
    • https://777mto.info/contents//files/34369022904.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d246d94397f---fisumaru.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2a1b907c---xosujupegutuxokikarununu.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/murebulusizevenuboguru.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/91900688331.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tujobekeletibopawim.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753a149007---88151933974.pdfIn PDF document text
    • http://biosite.ru/images/news/file/baxuxabe.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/20754980698.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/5082852589.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/41073856848.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/wavuwezilavogom.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/aab01d821ca95f07db75ca3f9cfd0816/fonotunif.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/78384899380.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_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 10788 bytes
SHA-256: 53644cf0b25202bfeccb3219ecd98f02a6303a0b118e7b4d45362d7fd1b4f384
font_01_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 16528 bytes
SHA-256: a20385f481bdfe6129a5c69238064177e42bdc12f54d95cbcff5148a29527257
font_02_sfnt_off00015564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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