Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a77143af0baf64…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 01:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e83a70d2b8ecb20fb50bacccff70a99 SHA-1: c730a3a44814e30cd0425678fed50531f016bfab SHA-256: 21a77143af0baf64d2aa155c973fcf0524ab9072447fc8313a0bac14d9992248
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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 http://apnschool.in/singhania/downloads/file/30368393229.pdf In PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/89855835921.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102c18a0203f---kusugasali.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f384c04abe69764eafd67458c69fe64e/58946800349.pdfIn PDF document text
    • http://jp-cable.com/d/files/33400681734.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210603_4A916BFD63FE0786.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/dixipawejatuxoxaziso.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0839ed148---dufojegezotakibowoguw.pdfIn PDF document text
    • https://cubic.is/userfiles/file/luvitodelibarat.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/losufepijitenivulafidefek.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ea72880f6fa28bf3efadf37d39fd774e/xafikiduterabenedexete.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/90466059898.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88433b757---14128043572.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ac242bc2---zomigegowedijozudoteparen.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/gakimulovadafaxom.pdfIn PDF document text
    • https://tepihtrava.rs//files/gozawiruwupapi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118ca4193cbe---60624684135.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da17bc7ea---negijakixowidopile.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/vosazixazijafalibidizefiz.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/tukezaketegodesabuwe.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/venurolubuvudagagijuzepal.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ff12fda3---wipuxipopebo.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/tuwefuzawavazukif.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/zexareboposidom.pdfIn PDF document text
    • https://ancoraeducacion.com/images/witufekigulakebafeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=moles+molecules+and+grams+worksheet+answersPDF 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_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 10996 bytes
SHA-256: 702ed441d398ccbcf5f272da6dbfa08ddac23e7ede9b62a290d385c12f530dc0
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 19020 bytes
SHA-256: 0686bcb65dfdfc5942862d2c48f27d73eaef28a01c14e754d7906b732d5900f0

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