Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb7905a59acb7a7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 11:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 945f2eeb9217f4dac4d4a68c7a105d3f SHA-1: 5d18fc31e590590b0906c5febe2509037e6a88c0 SHA-256: ecb7905a59acb7a7e3f5d9df069802742c912a1732fb3a14b31c292e27c8a967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to host phishing content or further malware. The presence of embedded JS points to T1059.007, and the nature of the file suggests it was delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f79a1a85c3---16504581557.pdf In PDF document text
    • http://capmar.eu/userfiles/file/sigujevudadepatisijur.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3aeeca42faa1d60b3ac364928dffb979/fewofusone.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/doporerudafatukufi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54b01337c---madolufidulano.pdfIn PDF document text
    • https://fultoys.com/userfiles/1539657781.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/mumoli.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zikijagopativer.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/37392974233.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc7a42b8a---xedalafubuxadirigojeg.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092da710c139---15790715015.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/50497697337.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/rulakonakutowoxu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/delamajidezesevetaw.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/72429121735.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e0bb9e9cb---63949661569.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607186b6bfcf3---karakerugikas.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/158143ce70d44f6272e9a6b1d575aece/fofudanovigitorumetikun.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/82535688249.pdfIn PDF document text
    • https://mollis.rs//files/xotosofogab.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4592bf7ab5471062cbbe1e5816e01edd/kezefusilegejedopawevejil.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa1928724---21931539515.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/59182388800.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/jodadebagijifewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manual+factory+reset+iphone+4PDF 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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 17884 bytes
SHA-256: d4428224ae75cf1a16ae4f382987bf2d45bf55190246aa00a3c8f7f6be25974c
font_02_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 10860 bytes
SHA-256: 72a31108c910888f858f948592540f01419c8fe11c4ecd4f8b92488d56de9284

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