Malicious PDF — malware analysis report

Static analysis result for SHA-256 808ba1eb455b439b…

MALICIOUS

PDF

108.8 KB Created: 2021-08-11 20:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e4fbf4dc1933ecdeee2ee39bb990bb4 SHA-1: 77c13c16ae207d952ae511e025efd6aa099b3046 SHA-256: 808ba1eb455b439bd5fb3c6706bea98df21f6eae7e370399a23d94937972742b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160745635a7f51---taxawopekovesogupujesap.pdf In PDF document text
    • https://carlojans.com/cms/file/rivujukas.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/sosovoguwifekuwasagawi.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/fegotogogorowumod.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507050453879475.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/srr7n13k84pmu182f8agqm8hhm/53579894743.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3c9f18bcc---94531199393.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xijopigalizifizenezida.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/karuxipivivurogepepatebe.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/82631292401.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210616024242_kpznsa.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/bc658e1351be4c0505d2bb655dc6a06b/88638313333.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5e13b426---35160984279.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///85244909608.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a61b379ee---28854349402.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/xujozanakedabowuteva.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/revirukepoxesij.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a893c04be02---juwegutazusevimi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/41eeaf006efed00ade7b72136e1caadb/nerazanajubixusuxejosito.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dcc9dca18---tudezokipu.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/tiferutadupelipu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9681ae3358ef0a6f7b18a2a8041e3090/24057306238.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c49d58497274dfb402eefeb9183e9c75/62216416600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=%D8%AA%D9%86%D8%B2%D9%8A%D9%84+%D9%85%D8%A7%D9%8A%D9%86+%D9%83%D8%B1%D8%A7%D9%81%D8%AA+%D9%84%D9%84%D9%83%D9%85%D8%A8%D9%8A%D9%88%D8%AA%D8%B1+%D8%A7%D8%AD%D8%AF%D8%AB+%D8%A7%D8%B5%D8%AF%D8%A7%D8%B1PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014904.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14904 32088 bytes
SHA-256: b80d513ff507eb31d9eb8c2332f24e4000276520839eb097e3daf57d2a8a8230
font_00_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 14484 bytes
SHA-256: 88f32a4d3e386c768b5f64af97cd451a60f24c21ad002b9f13a08127531b4edc
font_01_sfnt_off000136d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D9 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_03_sfnt_off00018128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18128 19556 bytes
SHA-256: 16747876029660c9305b4b337a38d1c9ea99144ef16cda332d0b1f1c3da7ec80

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