Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8b682f94702cfa…

MALICIOUS

PDF

107.0 KB Created: 2021-07-02 18:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d730112262a00528c34b659ae52869fc SHA-1: 6ceb653d5a173fa55d3d52f0c9be7730186b916b SHA-256: 5f8b682f94702cfad8b007273c7068fcddb4afe51ba8b52d4ab372c414a3d4d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised CMS upload directories. 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 analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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 https://fanaf.com/article_ressources/file/47728034892.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/08daf63f5e2f5de8d3dc742f5672afec/kugijasoxegutetagagan.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bab46fd16---wimapafujirepotazup.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/21832551138.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e0faf0fb6---rixitixabofebom.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/47030510746.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/fisoxetawuziluvorilamoka.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/75dcb13f2ed490d624c57d55c8669719/vetizomisipipegat.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/drn7dpvph42lql5mqmvcelc2t2/95866257720.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/84194970755.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/xoxusiv.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/rademem.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/mokesifofijakefolalib.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/50076091552.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e02dbc1600aed0195a636908b2c0e9df/dibomixigepududida.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1418120d33ed09e1d8d0e2e72fabbc35/44505005717.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c902551d---jatefokezo.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/ravefududuxara.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/73741113712.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5aed0952---18297787142.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/f1t0rtl7a23hnrvui0ncda4q0u/32015314650.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2283d4b38ea26500d6d82cbaf19bf0c3/51886157998.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210701_24964E10530070C7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=five+nights+at+candy%27s+2+android+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 18336 bytes
SHA-256: 8db235bc7baad1987a4f42ae5ef3e45902cd19d53b56a1f08905f45cc248c580
font_01_sfnt_off00015724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15724 11044 bytes
SHA-256: d39b8affd43490994daeeb1b007acd7d9c552671df7c07ce42f01945c2b292de
font_02_sfnt_off000170c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C0 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00018605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1