Malicious PDF — malware analysis report

Static analysis result for SHA-256 deba8b69bb94c640…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 09:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25e2ccf9386aa14ff50193f3738e1c67 SHA-1: 6deb7ab99adcaf6ddbb66c9eb060904bba4f22c4 SHA-256: deba8b69bb94c6404ba072c7941d062fdab3d4d999352802231fad77363b371f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, directing users to potentially harmful external resources, aligns with common tactics for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://innovativallatgyogyszer.hu/fileok/file/sedafegasenejolujokiv.pdf In PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64997465555.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pizaxopirivilefawepima.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/45334585932.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/41145823500.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87870911255.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142111cd9955---lapipupigupivufutaxeli.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bf63v8ac7i4d6hg6venueevuip/88403682010.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/rokafovogudateva.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/xowulozapujujunorigaxuv.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/29784384609.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/pisekopomi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/h997beiakt7kipqpeffiki4a55/93647720785.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/19372568625.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/28961841597.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210909020545_7t6ggn.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/406b3f611510f634db4025e54eb087a5/sunotifivupuvaguzulibubun.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/sibusex.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/zidolumitukavo.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/nekesosipujijog.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/bakubulidovodipelavejum.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xowotenudimiv.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/kafega.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/rizumar.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/lakazi.pdfIn PDF document text
    • http://www.heksan.com.pl/file/69746471935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+hide+apps+in+android+9PDF 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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 17348 bytes
SHA-256: 00dd9e298db68cc39cfe542a46468532e34499a82dbd842aa32c158f85e4dbae
font_02_sfnt_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 10688 bytes
SHA-256: 128c2fb20e00a378b416cd53f209ac43f974ce64b388d9e14121de2a9a2a67e6

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