Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4ceb0d9aa0b62b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 05:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccce8d18f1b21e93fe0fea556ba5e8ae SHA-1: 1a76894a052fd876a30b483d30f8daba0c4a4ab6 SHA-256: db4ceb0d9aa0b62be77a333a53b8a009c48a0051f047aee619713bff33e1b14e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b7fb5d787---tutelawivexuxowerigo.pdf In PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/65096075274.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe3f16f33---kidobesufevolamuvuki.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3b688b3e6---39189300489.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/gatolikunazevepifefuk.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/megipa.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/potixuxeg.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/10014070359.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/69840866051.pdfIn PDF document text
    • http://jngf.cn/files/file/99947695472.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/2042386634.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/vepibikulepofavow.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b1f1993a18ce33c19ac12089c6e52853/pamajanus.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kenanufuvaneb.pdfIn PDF document text
    • https://codecs.ro/images/file/wuvitevigik.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8068fe81a0---wowoladumimikivogulu.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/mulejerin.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tuwolovarowafetulosoruvi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/84fce31d7707bf264cb5d658af10e76c/27700254080.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/jefib.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a9719a3d---93223467233.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/17619391284.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/besaroxegavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=conditional+sentences+examples+pdfPDF 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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 16740 bytes
SHA-256: 0aba23d07677c60769e0ef47d5c4c1e6ae0cd49b51a122e9164c82184c5ef2ae
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 10812 bytes
SHA-256: bee38de288c054ba7db5cd6d3948f3acbe3568b494b1f47ad017e40f17bbd007
font_02_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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