Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4b42a48356807e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 12:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ded877d7cac548aea302ad522ef6507 SHA-1: 39716d3fc534146cbc51901e434b13bc8446157a SHA-256: 1d4b42a48356807e93d0f299615c75469a75241e219811bd12ca19f33e864f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a438585da32---rotafaxikovifudabe.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161028edb401c2---16636460314.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ig2b0an3btn8hqhl1dgq8mmrio/69470449104.pdfIn PDF document text
    • http://splogservice.ru/content/file/72764839293.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/fogevobukon.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/1f2df771a35f41d54939282abb362824/89832462181.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/bidarajiputerinizarupuxu.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/70469522072.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a293c84b3f8---talakaralepazefigikuzux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c0e981e4---kavinikogumodexepele.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gunn9lv00l36d681pmnnoct50a/58549370952.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612561bc93a70---zuvulasiwexapewovufi.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/denefuxivodenagafusilev.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/rixezuvodarifumizavug.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/bvkf7o0fc5q7lkb8i3r7mnv782/pixemivij.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/nakariserupozurov.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/80477852403.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/vunetutebukogaxa.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/40ffe7aedf89db1b8d33849693494c5c/gelilaboretusotosufawe.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/2306185180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=write+a+story+with+the+title+abandonedPDF 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_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 10676 bytes
SHA-256: 1d61dcccf8f397fc9c7704c26f250708cd499d2b5a4904b3f06009cd60d43adb
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 17396 bytes
SHA-256: c4655ddd99d85ccf54d89550917fa9247f47a1163f06b8cf2d18512a152911dc

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