Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b8d32cc554aaaa…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 13:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8a8bf1afc3407d51d4f22a0e6b181e8 SHA-1: 9fbd96b0132a5d026f90b6ac5be5b0036432d72c SHA-256: e6b8d32cc554aaaa4106bd5af542139ddb1c022166e1e00c96ab5284aca64ce5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://kpghomerepairs.com/uploads/image/files/45232684599.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f02adc63952---29394764258.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/45092244722.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0a5c97a3---mezetakok.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/74455350324.pdfIn PDF document text
    • http://getem.pl/files/file/2099261073.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tiwibare.pdfIn PDF document text
    • https://grandegroup.net/files/99633444191.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0tdhkp8jh3c9l9c4a4utv1r251/89785605720.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607882e2bf73d---95727314286.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/piwejadasururakaxikopatiz.pdfIn PDF document text
    • https://birudongker.com/contents//files/nevibotorudipudibadarinib.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e9dfa8f02cc4a9f479b2deac37999ff1/60089633209.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/dn75soqqldgjg2e7u131vc08u8/potoxafapivuvifemumidu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/i9t1tj366mbjqt6292p98se7pf/motufadarefib.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/wiwidedubiguzamefufiluwu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zapabapoji.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jcmab6f2dsn87cn2qvmo6u7631/pefuwerome.pdfIn PDF document text
    • http://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/zulatoxamutan.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/fijodudubumibi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fa0ec448---kozukatofu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wikilibitufexomu.pdfIn PDF document text
    • https://wita.lt/images/files/47558742105.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41611637293.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/25267263446.pdfIn PDF document text
    • https://wonkingchina.com/d/files/gajerozel.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/pulexefevena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=foxit+pdf+editor+pcPDF 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 10212 bytes
SHA-256: 15f5fdd20302c041d4020080f717cbde58a2d322b81b6e60c11062fe4fbe3a5a
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 16644 bytes
SHA-256: 2741f10094dee00e083ace5fc107bec6bae866bb03f4b1e55782031906b5e6b7

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