Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fac12761c457843…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 17:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a3b2a333b4418513f4e0b1d55229c61 SHA-1: d7742c3b24427794daa03fa77d1f94a4754fe5be SHA-256: 8fac12761c457843a75e472cb9b5e52358539a88c7a3df3c453a780203db507d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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 http://areaengineeringsrl.eu/userfiles/files/55975013953.pdf In PDF document text
    • http://revize-elektro.info/UserFiles/File/92798976132.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/61254942839.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/48155101730.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/15279961591.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/69269558531.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/44360600800.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/wuledabumop.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/46902458446.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd41417cb3---bizedalef.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/730bc24b833bdc03af33901932099061/29055666523.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f831db8f---gemanura.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/48970174475.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/raxulikiteloronanez.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fovurotef.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/vazexejovofupasexosifep.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc15d455f9---lijeja.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/87565966089.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/80885864019.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/wonelowomasezazerexu.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/5235957264.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/5576758327.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/jinokef.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/vegebajixoxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=asylum+2005+full+movie+putlockersPDF 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_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 11104 bytes
SHA-256: 60f33b589382303be8be55637c09e92612d547db50935076ca2844b240d9ecc5
font_02_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 19716 bytes
SHA-256: 5b50d2add6bca15c4173bc5b5b69ff0ce54b3329add4e740dc182a264c6cc529

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