Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d71d8d26f02f52…

MALICIOUS

PDF

96.4 KB Created: 2021-07-21 01:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7af4818f967fcba14028ff105fdce31d SHA-1: 021829165385c5ca7bc654710a319465fbcbada8 SHA-256: e1d71d8d26f02f52a82eb7c7313d3749912754e10f2c626e13603c689c1eb4a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7586f6021c---76791272110.pdf
    • https://rocksoliddesigns.biz/userfiles/file/buxorativukidekexudopuf.pdf
    • http://gtlitalia.com/userfiles/files/safujer.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd8ebfa6a---49975012990.pdf
    • https://la-klamm.org/userfiles/file/77713784827.pdf
    • https://chp-travel.ir/data/file/4749117412.pdf
    • http://epoxidice.ro/mm/file/dukerewavopakovuz.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160948e9662f70---witowuguva.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7824ba7247---31843564848.pdf
    • http://sxhk365.com/uploads/file///welebalujategemev.pdf
    • http://alnadaoil.com/userfiles/file/jexubetowedenipug.pdf
    • http://romanakladatelstvi.cz/userfiles/file/dibuxemadanasunidu.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8f69f3f4---vumuzar.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vn63jadcnmoonufbg2rnhhl59r/68093461777.pdf
    • http://pileshoppen.dk/userfiles/file/74194339642.pdf
    • https://filetorme.com/upload/files/7683474309.pdf
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/zewupabuze.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607445f55f233---2377605219.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e372916411a27eeb93461bd2261540ad/20470948898.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c1fc00dbb07cb75aeec0eae829be45ba/43646387584.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e49unijdn3fak0tf615o31d4lu/wowosamojeruv.pdf
    • http://technology-mp.it/userfiles/files/bomixigilazepem.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff9c1d5cd---56421019294.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/pibisumotobudavazutonexu.pdf
    • https://louvre.lv/res/wysiwyg/file/88641288154.pdf
    • http://sushinamu.com/uploads/files/wusozabiwimuxiveguber.pdf
    • http://ronaldtan.nl/images/photo/76129365142.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=do+sharks+have+live+young
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011650.bin
ee1be214eb7a728c428b89673705cd29c7932e2fffa7a9ca648b5ce303b47d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 17320 bytes
font_01_sfnt_off000143f5.bin
e23ff6e5d77385bd33eede644d096d8b0148ac1550235ea7cccb7f75d2deb6d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F5 10660 bytes
font_02_sfnt_off00015c59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C59 16792 bytes