Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa535ae3d5c39a2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 07:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f741aa556a0b303db3370480f67e1a4f SHA-1: 1d2601133da823d9e46c2524eef9c0f46ab99518 SHA-256: 5aa535ae3d5c39a2d50e1fe569558afe6b510dbe29846f7c53d86b3dc68915f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a collection of links on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://arunimaflavours.com/userfiles/file/93777010131.pdf In PDF document text
    • http://goodtraefarm.com/ckupload/files/fijadirogame.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9qpf55mocf7qlp20944bap036u/xotejisolazurek.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/06f1f2282f0d29e05d68914b870a8225/49455833622.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe9b0dae52---gozagalikubitoxok.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/42246962774.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e2825905---tuluset.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/97875413711.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3ba92fb6---linas.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/18970167473.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210818_2AD7042E59F0633E.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc43025f075---96896095791.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/fozizebotedonunig.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/zanedak.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072acd5c2e3c---92699191385.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/81455065631.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdfe470c3---durujumunemulek.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/181035362.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f5cd82e5---52786481216.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3b920f80---57236576467.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/27180100881.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/7673908615.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/wegutapovutulube.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f046c66944---mewewibevinorelinorenepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lay+or+laid+downPDF 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_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 18892 bytes
SHA-256: 0f6d4b20aee7417156fd4ff567160860f545bda3008a8100f5fc5aa66a23adc3
font_02_sfnt_off0001317d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 10000 bytes
SHA-256: 6e12e4c31f6a4ef4f9a6eacba5c56fc614bf555d599a992c6a1f78e91c9f99df

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