Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a82a4a94d8a6f4c…

MALICIOUS

PDF

85.4 KB Created: 2021-07-24 05:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fe5540c5bc867c44a72d56e3a3218f4 SHA-1: 6b2815e510659a272bc7150298e1ba975a8f0f9c SHA-256: 4a82a4a94d8a6f4ccc6de51718af68df46097e623b41a2e6506b2b73de3305bf
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cddc67f0453c017ab9b6193c9f77c13f/rizojapi.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00404ee99.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/84feus4ffkj53fbhtmqb6b3k8u/68408128558.pdfIn PDF document text
    • https://123natura.com/stockages/files/lagaxalozadetu.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/fuwofuzozixi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033c73647c---tizaju.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ibtaeflferqqtbheijeomt6tjb/miwoxigomurezu.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/39744600674.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/35dd876b7910d7547358d09045a2b295/rujekakikigi.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/muwavokamesafolekoganogol.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/tigobakor.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/bisamugotolano.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/simonopedagedumi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e285a0ca05f---ratukazegupudajagudoguf.pdfIn PDF document text
    • http://aps-mes.com/files/file/29617170826.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160712f18c94eb---jubaleneberafu.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/63605716547.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/75545167021.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/gatiwe.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/keronimofogaxaj.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/57722164364.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e6ad566d1---6982982920.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/vobipivudove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+types+of+intermolecular+forces+are+present+in+waterPDF 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_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 16808 bytes
SHA-256: b9b5c9c64687bf63ca4994fcd3e493ae47b20a6a0f73559b4c5efb25b4908b3b
font_01_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 11040 bytes
SHA-256: 9ce4a12ed921d9e4614cce8ad7316c87ca01ff6f47d4439530d8c5631ddec438

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