Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fccda0a95e122e…

MALICIOUS

PDF

90.2 KB Created: 2021-08-22 10:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d832106a258194f32a60cdaaed2d7241 SHA-1: aceefdf5116b5bb2281a7f258342a4e191f9e0b7 SHA-256: 89fccda0a95e122e7a94694f5c65f599f9df2a410ead0317402c0314c7ed3fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs suggest potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jujinijawixinenutuv.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/726792e1e7418272b371a06922f8377e/damuzosuzadule.pdfIn PDF document text
    • http://emeat.ru/var/files/82127035151.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/44864916186.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/namosijusekidukafewegu.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/39563048047.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/74070593204.pdfIn PDF document text
    • http://zuche0551.com/upload/file/miwoxiwetib.pdfIn PDF document text
    • http://sun-tes.ru/files/file/dewawubomizebupedakiziwa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf750fa66---47968019855.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/55895633625.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f6cf2066---93309425760.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b9cfe4de08e34cf5b109754f1ca3a738/85744316086.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/31176933602.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fofomukizinopetezinabepu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8cb0a0dce5d89ec0b95bd81f13df4d4b/73102272393.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/06/files/210628225835.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/jatefolo.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fewofabefelobepi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d18c554fc---tizoxuzavezoxavaluloze.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/32664575137.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c0963db1e---wufibiwigasobefal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mortal+kombat+x+fatalities+ps4+youtubePDF 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_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 17128 bytes
SHA-256: 8db3c33039bc871754561ba6206f986dfc83137b5419af4381aefd6777997dd9
font_01_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 11036 bytes
SHA-256: 1eab4c0ca139d620d324d503b1502d2ff4a517d32712942fd1e767898f1214b4
font_02_sfnt_off0001428c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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