Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b39a6577817753…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 15:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 312e7be260b1213b6bcbc88cc1ef7b15 SHA-1: efb3a72a6b237b1d0aed0bc8a98518acc5370034 SHA-256: 80b39a6577817753c5663730f94128a41239d738cd5823a0278ebab6d85cdcc8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded links pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07d8e0f4b---bozejog.pdf In PDF document text
    • http://ok-poland.com/userfiles/file/jadugosofitiwen.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/migaxaboz.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/91959043974.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/pifutedofupa.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/15434883347.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/lutadifizovutisu.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/naguxopuradu.pdfIn PDF document text
    • http://szhlfz.net/upload/vaked.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144f05e97870---16511105600.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/vejixa.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/18065231378.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18276d2b6---jogiwaxefewafenaxupeguk.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/vujulafazazo.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/pevigenevaxunoneju.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/68557110518.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/xezitiverivajir.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/29875617794.pdfIn PDF document text
    • http://annabarons.lv/files/files/4791222690.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mttqqd8jdp5js17o12nphi26j1/64295179686.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/dumatorozojabage.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210908070038_300662726.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/fotagigupuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+app+to+watch+footballPDF 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_off0000b08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A0 13952 bytes
SHA-256: b92ec216db6e851d5deecdafe8d236b9551ee8bcc2a4e023cc604b3652613bb4
font_02_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 10416 bytes
SHA-256: 5a7ecf2b6d80c8a311495b7aee391c866b2379fc1a92b667aa1860356b0feb95

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