Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e832af39d7f3e99…

MALICIOUS

PDF

90.7 KB Created: 2021-09-18 14:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef1797fe13fa6c7a42feb8ceaaa88153 SHA-1: 2efa80835a0e0687a5124b6b93c8d369b0012cfc SHA-256: 6e832af39d7f3e990718f5a692449c1203e88a7fb94f9dc4a2d365789e48ff18
164 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, potentially leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=wbbse+class+9+math+book+pdf PDF link annotation
    • https://newline-eg.com/userfiles/file/davogagusi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f02dedfa---77588655900.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5006c9e02583b5e383b14fb5ca5b532e/wuvoripenoxanokawatumexi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/uus8b6qota097fu46oc38qgc92/mukazipezenexafejizezusa.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/simudiviwepapemopuzuva.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/af05bc1fe11073999013836606a0c0e3/40958006491.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141f873cac11---72039827320.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/4369732025.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mjcq0dij97843k17bdd8lqnvo4/74870816457.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/kusezovu.pdfIn PDF document text
    • http://chieucoingason.vn/files/77956834767.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/67029953395.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/tuwajezixedezinewimo.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/mopurijo.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/zezabup.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/70735389460.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/runutaf.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363dcd71ae5---73464994574.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131ee246588c---pozolujozenuwobejazoz.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/pobivobupapawasazaje.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/50913260843.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09d2f322a---91242013845.pdfIn PDF document text
    • http://schubert-hh.de/image/file/23398538647.pdfIn PDF document text
    • https://estoniapools.com/contents/files/54810992441.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 1760 bytes
SHA-256: 5fff00743cbca99111c2a7ac28d1b3d5d8f2da3a717fbbef75202c4a137a6772
font_01_sfnt_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 24736 bytes
SHA-256: bb4ed6434cc845cc2182413998abd7b4c70c1d6091ede3db41eb085073a23cb7
font_03_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 10984 bytes
SHA-256: f701ae5fe7feb986a614098afd94865d8fd84065aaa957f363ac0b57ee89db1f
font_04_sfnt_off0001466f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466F 16260 bytes
SHA-256: bfb110c231d9b2ab9c590f5eacd3aff8f33202491aa560690fbc954ba2d74813

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