Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c29fd6ff9a42683…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 01:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6af41f2b2dfb77092773932d534e6dc6 SHA-1: 30961241dc7702975a3029b2882b93a72617f33b SHA-256: 7c29fd6ff9a42683281e784a294196dd2c92fd0400a297c48c9f9e99cee44bf5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The presence of a 'download button' lure and instructions for a 'password-protected archive' suggest a social engineering attack aimed at tricking the user into downloading a payload. The embedded URLs point to compromised WordPress uploads and disposable hosting, further supporting a malicious download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=download+fifa+21+mod+fifa+14 PDF link annotation
    • http://jafra-com.at/userfiles/file/45820573821.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd9bcd222---tegesuvot.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/41122542620.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/5598808849.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/55642327056.pdfIn PDF document text
    • https://aokman-drive.com/d/files/vufebonofadem.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/92703018483.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/42770117110.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/95006677629.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k2m5baphpvv0g3cgg2glkcj4vd/dezinelomigitapasifetuv.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947ea68f11---55536727108.pdfIn PDF document text
    • https://12waktu.com/contents/files/safipelemijomirefutema.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/biseropilugi.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210917050044_Z2VkYWtpamFnYWxheHV3dQ==.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/8637929353.pdfIn PDF document text
    • http://kmsenior.org/file/files/40826809699.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393d6debf14---91009618863.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/xodexokupawexagiluvajobe.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090203082873499.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/gewupipigevofubikexixoka.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d38b238a---kogederosa.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/vezaxas.pdfIn PDF document text
    • http://chineseclothingonline.net/File/rukokuxepujakakij.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/puzijupegetasibubidavogaw.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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 18612 bytes
SHA-256: a33347514cc0325ba38054b8b5ac38bec18ce4e764823ee515daa86e5db21b4b
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 10352 bytes
SHA-256: c5ad1d7379db588bd9926211fb5c16d9f3c95e09c085ad8d4cdf92dd3fe0f25a

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