Malicious PDF — malware analysis report

Static analysis result for SHA-256 0caf7f04238b36b3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 13:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6281bac6109212e156f7ef3cbfcfd616 SHA-1: 02bc0a9f3268ff0cd29ac0abc97552352e63da28 SHA-256: 0caf7f04238b36b32af9935114e4ea6cc07075c6b71278604536a93456f0149a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme, where users are lured to click on these links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/jejedibujuzaxuturola.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vlvd74pg3mf1ete2f306kebhp2/mulalekuw.pdfIn PDF document text
    • http://abnicum.ru/files/file/fewosuxuwapusudemubewigan.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/fufokivira.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/resumufowonidupiravuzeju.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/jozovupapurizit.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/zovafewiduwo.pdfIn PDF document text
    • https://mauspro.net/upload/files/74506808750.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e450b3ead10---niroladufawalafu.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/70987742488.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/92057394883.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/siniriwivotuvajab.pdfIn PDF document text
    • https://asiabiru.com/contents//files/dapobuziganikagix.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/neziseraduviwimudojo.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/91941453704.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/puvijimarojufujozix.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/706489qch5i1ssridjomo284qb/35289282199.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/36140245497.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0f25a9a3df62b80d440d6fc2e18028f7/62708576254.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2c5ed993126000d18545d59bb5722ccc/37753265011.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/911204299.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/35683455353.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/45412134959.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/82279386363.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/70183126743.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803da412e4b---30151673447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=franchisor+advantages+and+disadvantages+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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 10896 bytes
SHA-256: cf1fbb701d33bab04b1b8af0de5495360adcaa2f90578f08591684caa0a35ba3
font_02_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 17716 bytes
SHA-256: d7df0071125cf7a6a1b1eb1ac9347556e737cc75bd3c3d733ce4b4018e520309

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