Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7eb8a8f3b66913f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 16:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05ddb0a4753f62dfe3ebd6cbaa48a83d SHA-1: 16e32682f3130abdf07d6305c7e6de333196dbb5 SHA-256: e7eb8a8f3b66913faf98a2a078c7cce6171d1fabb4b4f2636594a41e13741bee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://irlanc.ru/uplcv?utm_term=como+sincronizar+celulares+android PDF link annotation
    • https://cowik.pl/upload/xewetifogawolagugupafono.pdfIn PDF document text
    • http://dd-eng.com/files/files/potadisedonoker.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-10/2109101254200263815krjw6eor5mw.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/fedemejofasinejeten.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/kiliropulezu.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/wopilososew.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3767309326135d8242dc5c.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f542f2fea4---33110143074.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/43447598315.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/82afcf853c93d4c388bc66b69d8ebc9c/varisoko.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/81723a130e90cfd01242be30ad97e1ec/91268809598.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161334ad7becde---fuwogibizipe.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f24419f05beb8d0c905d0f52664b5467/62746416041.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/dupanegiwereruzex.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/bonipam.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/xapexinil.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dda4c3e828de55e6f010bf165bd3a8bb/pobajoxi.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/jidexu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5b7722678c7274c244613c0f61457ea2/gikevatapis.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210912225418.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/28355196616.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/14184597621.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/tenibemora.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/46505446155.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/gozomov.pdfIn PDF document text
    • https://flomogroup.com/upload/files/menelomu.pdfIn PDF document text
    • 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 18588 bytes
SHA-256: ad41adf6d4ef7f3756d2a871677e5ba3701771051e5c2a4335e8ab8c084f7f21
font_01_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 10624 bytes
SHA-256: b5b82352ffcaae598294d3363695086d6e60d6bcf2ab95d2aebc24b1e6387753
font_02_sfnt_off00012cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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