Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8646fafcda30617…

MALICIOUS

PDF

86.1 KB Created: 2021-10-09 22:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6eb9e8afc10a271ed03e0528cca9bd60 SHA-1: e8f5291f444baac2e1a6369e9271977911bbe8ad SHA-256: b8646fafcda3061774f62668ae9afa712ee9ff1e78e1773a58bdda918bae5bb3
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and a machine learning classifier. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hainfelderteich.at/xomiwuzogomogetut.pdf In PDF document text
    • https://produktybhp.pl/pliki_user/File/kobelatidilovizu.pdfIn PDF document text
    • https://hoppe.dk/files/tuxawuxuxas.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ujktr1bc6g40tub35qebemvdts/30436674032.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/wigijemixoguzotuwavum.pdfIn PDF document text
    • http://honghuibio.com/d/files/zubifetedinazi.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/63220773014.pdfIn PDF document text
    • https://maria-galland.ru/files/file/dudunebobu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/refetadifevefusixowazo.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/20896612173.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/retes.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba2df1fa4---19786415291.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/ridilodaxabapamewubez.pdfPDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b5e57f774471d5bc7f9f3a323000a6e2/jemufuxadedakukuj.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/96179621332.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/12112798583.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210916_174804.pdfIn PDF document text
    • http://sartor.ru/upload/files/33319106360.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/xufosupakiwazitilebomisu.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/63978244513.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/nodezelevavijizipazejadap.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148323c14a85---xexabudutobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fish+good+for+soupPDF 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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 10312 bytes
SHA-256: 921ba1a3a28d4968ae54a6ecd43920b05c16983e1713fbb93e157908f660ddf6
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 19980 bytes
SHA-256: c86bf36a751b388d15e38867b3588f13ce29a8ee0cf48c0b1726bcfdb8caf199

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