Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cae883acd940313…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 16:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7348a9273dc447fc2b2a3f682e13531 SHA-1: e0de9c83c1af03cca541b5b6163ce2c2ddadd11d SHA-256: 9cae883acd94031365e7506a6db1e60867dcdc391e6d972401d80de12606fcb7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ats-dz.com/userfiles/file/fetojomolifa.pdf In PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/kanogoziduv.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/12957652310.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/kezabivesexojat.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ajtrhaeqel8jvahncc903mu98g/fetagupumuxuguda.pdfIn PDF document text
    • http://come2menorca.com/images/file/91506899433.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e27e629015---lujipijavimej.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4dd628970a55d4ec7d06f0773bc04943/binenegagidivoxusirobok.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb3b6aeb1---56393545119.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46488468661.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/89441706719.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/takefonunaforumijuriwoluz.pdfIn PDF document text
    • http://falerisztika.hu/tmp/tedudafolu.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/sofujogarusoti.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0ec2a8ba0---38476521183.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756b48b6ea---sotimibetudesemagak.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/16472067336.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12873842996.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/71182971214.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/wekagusazizarezowebasoz.pdfIn PDF document text
    • http://gtshotel.it/images/file/xorobakaxarobib.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/2358130415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=file+i%2Fo+in+c%2B%2B+pdfPDF 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_off0000c966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC966 17400 bytes
SHA-256: 66a5d099eb311b7a15f80a8fcd5c07a8511f4a106c5e14ca40f0a821d2205f82
font_01_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 10096 bytes
SHA-256: 7c9f9ff8601d9af9e342bb7d62069c446332154fe6f9ea88e24d8c98fe5c5e34
font_02_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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