Malicious PDF — malware analysis report

Static analysis result for SHA-256 e477fd7c6deddf54…

MALICIOUS

PDF

98.5 KB Created: 2021-08-22 03:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c2bce6910afbb71cbca5462902ae197 SHA-1: 6862d2e66aabb4a04dd64132bb4d8399241700ac SHA-256: e477fd7c6deddf54ed552a0d10b82e2bc606d8e667673f6b3226be091ea9ea4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm pointing to potentially compromised CMS uploads, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs suggest it is designed to lure users to malicious sites, likely as part of a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609993115eb53---ximokov.pdf In PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/bavomafusajamibekejabu.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/zisugarokepameke.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/nusolafimovowen.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nujemonaxovik.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/busopim.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/nomoduwanetonigaxebesu.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/fanunexavagogozibofawojis.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jaginifibujuwevuno.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/47185867348.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/33943208314.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210723004956.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40e42ad18---30780593756.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/5832540136.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/36178698127.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b792ad89339---livakaxulewuwumakepij.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5f6b03pbdnno53t267616p9fpr/58335080653.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/i2a7o3j90f5nampeidkmb23oid/63104707968.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/panafowofikuripov.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/limedunifeliv.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609966c9366d0---91469356378.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/78715204333.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/th81jd55fhra492tuqjh03nf0c/wedakaturevim.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/tawakabesiwejebov.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/safisogopujetedazutak.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/76541700158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+world%27s+fastest+typerPDF 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_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 17544 bytes
SHA-256: b900db4c8002ab5e7ea0986432540c98fa0b710b014167025eb4f6286451acd8
font_02_sfnt_off00016250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16250 10720 bytes
SHA-256: 3d22a53150329c760ac755dadc1c7eeabe96e0f0d62a3181657786bf5a77f991