Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5abab8a49d7e2c5…

MALICIOUS

PDF

86.7 KB Created: 2021-08-07 13:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7871cbe8f81bb324fc5c9eac9003d2ac SHA-1: 0ee0c8e86bb1d8171dd82edfdfe11c607bf2dda9 SHA-256: e5abab8a49d7e2c521b9c3ce604ba7f27b72f7aabeb164e16a6fbfaeb15b70aa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://srihemkuntschoolint.com/slbdavbatala/userfiles/file/64844279996.pdf
    • http://betonkeritesek.eu/Content/files/kibijoma.pdf
    • http://baigeleather.com/userfiles/file/3896684121.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sujufezazukapanopogaf.pdf
    • https://hotnews.md/upload/userfiles/files/92128160517.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9eb20b5a5ada13ab033f8869db4df678/26659334714.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4a35ad6ee026cbeac46c651b50a2001c/78037635777.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/db1a3565f5240a6036207f652b0f7dfb/2097924202.pdf
    • http://radio6deenero.com/uploaded/files/kegazakuju.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dd43bb37---9225206261.pdf
    • https://autoroman-service.ro/imagini_ws/rorowa.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/322598052.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/fe60b566eab56f55edec9cd7067c7cb0/37037924200.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/figogegewafalepututufarit.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608223f294ebc---sunonopak.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210708_051439.pdf
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/tidufotujibetosuzivef.pdf
    • http://instant-image.net/UserFiles/Site/File/88191676970.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b6379d9b2---dorifo.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb74f1d526---40147630329.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608285042d304---luvopubiwiwe.pdf
    • http://apvn.info/userfiles/file/fabivana.pdf
    • http://sambometal.com/dataroom/file/2304140773.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=starmusiq+tamil+old+songs+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 16792 bytes
font_01_sfnt_off00010763.bin
424015e48b5950fc3e7588038f759d26848d0599233d49987e17877bd855a8a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 16780 bytes
font_02_sfnt_off00013359.bin
3192ba740103c398e12fdf1f6b252721bcc0fa83fa9bd2c0284fd93965c188a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 10864 bytes