Malicious PDF — malware analysis report

Static analysis result for SHA-256 288b026322e5dc5f…

MALICIOUS

PDF

85.1 KB Created: 2021-08-15 04:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1ec8c01c9170b65f67a025521474ea5 SHA-1: 07e6eff48f4c34417658160b7f2c755b1efc77ea SHA-256: 288b026322e5dc5fb6f5ef4c8a74394147038ded8ae6ea0978abcb81e2721232
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=tamilrockers+2017+tamil+movies+download+in+madras+rockers PDF link annotation
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/revoloxamakimokutit.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/rabezotigifapeg.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/fatejamuwegilovuz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cd100ed5---bedetadaputaxebe.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/52957934264.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1369801b3923422ea2196b9b738cbd2e/45536837944.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7311599fa---finuferiboxexezorenotalix.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/76084920672.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5711e0ef2a---tofutevafolixexorabuw.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/dogarita.pdfIn PDF document text
    • http://www.toptehnik.si/images/67741349488.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/vovimonakewuzidopolutogob.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16241467308552.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/rudonatonotelumagevamiw.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/votenowogazirevise.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/69882569284.pdfIn PDF document text
    • https://eurocomm-italia.com/file/44956073421.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/pizofeji.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/17555616061.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/sazozizixib.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900223e83c9---vazifenifosonibozogu.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/84026843055.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 11084 bytes
SHA-256: 4bded1cd397bc5512a3b5d94155adb90c4cdad8ec2bdab84291a94ca644b733a
font_01_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 16908 bytes
SHA-256: 31c48aba312a870e2ef47a45294cf2042a530928b29104b5d01e3d07a571d767
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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