Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d083273f97ad621…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 05:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 156e0fbfc66d8612a11c3d1c3310e38e SHA-1: e92dbcdbbb721243ffbef16fee51da1fde96aca4 SHA-256: 9d083273f97ad621ab970d68a7fb7cbb7b7171c58607eb259d5ba1090eb5fb70
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an exploit or redirection mechanism.

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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5726c5b2---renuvodotisuxoriro.pdf In PDF document text
    • http://maryalo.com/userData/board/file/37504553192.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/22fb0a19fa39f6e14ef484714587add3/xibuweviwiti.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/45361183059.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030053027567.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/1211779162.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/favaxixasume.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/fizuwizepuzo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/83768594615.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140938b5d5f3---fawukano.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tefosejusoxitifemu.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/gasisuz.pdfIn PDF document text
    • https://webmenuplus.com/images/file/45896533294.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/46824040323.pdfIn PDF document text
    • https://ghnservizi.com/file/41104848525.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/1096017714.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/70303320673.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130baed949d1---faxinovodoremurunexi.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bodap.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/87214226052.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/sisoxapafikivibugo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134b898264e5---jofetuburare.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/nevolalalomupajopo.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/43496424175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=emot+baru+di+iphonePDF 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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 16404 bytes
SHA-256: 50a812b4b97e9c03de9fad772c14a9c50e8a09e2f0d9bcc7deeceda71ec44ec6
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 10668 bytes
SHA-256: c0136ece052ca37b72979f4bfbb80c87fa1977374fb2e730234984346e28e6a1
font_02_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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