Malicious PDF — malware analysis report

Static analysis result for SHA-256 54868e7a86cf2be5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 17:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f32a00a3f84969afca48e202a74401d8 SHA-1: a7929011f80c021d8e2e705365d6459ce7846e43 SHA-256: 54868e7a86cf2be5385dbf6856a2a91585845f9769b696e3eb2a0230fc2e52be
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lajovisena.com/gallery/file/37182829070.pdf In PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/migugibodute.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/moluwopaseretud.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141f5233eaf2---52396475151.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/bujovabeveku.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210903184641.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613376c25f4bd---jeken.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc1fc4183---80838039155.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/76504251826.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/fowofojilin.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/wuxagapunixorixowu.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuxazidofomumobagixe.pdfIn PDF document text
    • https://asken.as/bilder/file/datifujatusikurudikavifid.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/vabevasukoruvakewekafebi.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/96560413858.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/1i7pmps3ufcp6orgo1gnikf5u3/79792601043.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/gewuratuladifavap.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/zojir.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fokifixexipuwedivuligojul.pdfIn PDF document text
    • https://icbacademy.com/upload/files/34397439039.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/penanuzevawet.pdfIn PDF document text
    • http://adriennemason.com/assets/files/varebugape.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/3443662366.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/88201195649.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9a3c56bc7c387ca70f3561b5928cdc73/81869043079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=john+finnemore%27s+souvenir+programme+series+8PDF 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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 17324 bytes
SHA-256: dbb941986034b12ab14714b8d8b9ac2d567b953f632f3356b9605a6a542bd04f
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 11060 bytes
SHA-256: a98ed6fce697a87a68af3fba81fd90f5430d0cf9c66654d84fa83db93a68b9bc
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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