Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7664517d35f1cd0…

MALICIOUS

PDF

92.2 KB Created: 2021-08-23 14:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef07d7c6416dac1d68b3bb33b722707d SHA-1: 65124f5ba6bc28f93c8c297c515722105d911ef0 SHA-256: b7664517d35f1cd081a3303e4296687835d4d867441decdfccd8e28ebff15b1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains, likely intended to lure users into downloading further malicious content or visiting phishing sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://alarmy-kamery24.pl/userfiles/file/rapalusatarugorezax.pdf In PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/6f4fdfd7feb9c0756f54c7cb808b96b6/81811654675.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607f817a3e536---zavinafop.pdfIn PDF document text
    • https://go2germany.ru/files/file/raxiripekosowefeto.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b129f11846---95355680714.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/63694274644.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a923d462d71---88826459691.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/41713285006.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gumitesulagonub.pdfIn PDF document text
    • https://gangnampools.com/contents//files/93731979447.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/sozopixog.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/94749031496.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/iammad2g54vnvjhfudinulph5c/52742297707.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/kutugosuwigarawan.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2c289020---526676641.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/zowujojokofekix.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/boruragumoveduwusuvik.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0437e2c86e49c9ac5ebe7b653744d231/56424382951.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b0cdcbbd7228415220cb2b7f6a96082a/28511018164.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0340ab422---sagevazuponutilebaborur.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7d38cd2961d8d68aa50d679a5502af28/doguda.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/461d95df317e14ca531ad722f31caef4/puwoxomizemalikenev.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/bidav.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/31657852562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+screen+rotation+controlPDF 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_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 17708 bytes
SHA-256: 574caeb51f10cf46f1424a3def4991d958c30a68fd6a382f1a7e8928878327b2
font_01_sfnt_off0001337b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B92 10448 bytes
SHA-256: 4d40efaf9cd8a04d20532a35013134af15984aa2e3c53b8255c44e461c8e47d0