Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8e8001b8665263…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 00:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 914f0fe13388a9585303a529edff4ac7 SHA-1: 84f1d2043f91a3d836afda1fef24e5d21a003cf1 SHA-256: be8e8001b8665263dacac755dc4f1a4be9c192017fffc0df636b2a280a612527
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories, likely to download further malicious content. The presence of multiple unknown URLs hosted on various domains supports this phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/214047c7a70e75dff570a1ae72d7a79a/jowudesavew.pdf In PDF document text
    • http://tsmsaldature.it/userfiles/files/59073040030.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jc8f4q41sfi7rofa72t0spageu/fenixewusafezusik.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4cc422ce35b5e27742826643313ef728/josewivufu.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///wuvazotizim.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/2628177842.pdfIn PDF document text
    • https://network-italia.it/file/gumuxemidopiwojiva.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/rumozinul.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/46874463464.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/31584134642.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021082920521911.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/bopunujikonemetaw.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/09/file/70923845085.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/mavewa.pdfIn PDF document text
    • https://ikima.fr/uploads/file/nelexegivetodawogim.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xogesixabufinuxeroluwuj.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/ponuboxox.pdfIn PDF document text
    • http://centrons.com/uploaded/file/129882666460fa48944cfc4.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1t0qighopado60hcjdo6fe8k0i/niriwajojimux.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7e6537b5193c92ff0aa547e414791d62/talikar.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/zerijibepikok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rrb+ntpc+previous+year+question+paper+pdf+qmathsPDF 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_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 11452 bytes
SHA-256: eca8fb4f929e6542008eab500cf8fec99090922e414c4235e10c32558b2ec4f1
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 19116 bytes
SHA-256: b8c53eeed44079e3c9c689aa059df706f6a352771eb5a44415e4de3bf20bd062

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