Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e11394d3c9fb71…

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 06:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b01385bcb1238be58def30fc14065a3d SHA-1: 18c09c5de81f01f6f1ae8d5afea22b982f11b1db SHA-256: 15e11394d3c9fb71bd018655baedf08a59a9379108644037c76e9ee0bff15b4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These elements suggest the document is part of a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=how+to+measure+australian+shoe+size PDF link annotation
    • http://aklond.com/UploadFilesfile///2021073020033469.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/74292624207.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6fd9ef18771261e92ef373ccab4ae9bb/fogajubibajew.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210607_68A45DC722A574F6.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7ee0bc111---pisedo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/f60bnrehg4r3fm9vdnqmbtj8sk/lafexumuroriporasin.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d1fde6cacceea8e89087a091861b8bab/jedazurofivibemudawu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lomesufaj.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bkkcvudpgt16hd1vvu38dtd9mr/bavifipadobasawisa.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/11859884697.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/favifegud.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c1c5f9a0dd76f92185643f23f4fbbd11/67725507950.pdfIn PDF document text
    • http://canvangdientu.com/images/file/94601450317.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc83e4e95b---90780201208.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/93451892105.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f595cc790a---1191394472.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/98516438366.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/80563036890.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/58098580717.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/60910a8192d5acc0b7c68e174eec731c/82761843951.pdfIn PDF document text
    • https://serka.com/serka/upload/files/19679279702.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/solok.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/tokorobufozulinujotom.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6dhvem5sumf2r0pt0lj3v1d7sj/zabareku.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tkp7bb7emfld2teessc8dutdhq/xipewilit.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dd7837f9d---vewagomigixutuninejerar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 10608 bytes
SHA-256: 99b0291f6fa6dfdadf16cc27447f6d0ed9b09ffa65139bd13b06309aecbda8ea
font_02_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 16860 bytes
SHA-256: 3543e8f58dee93ca824dbb4d196f2f5b2baf36454f61de45636fc307f2605f4f

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