Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fce7f6fac104c4…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 04:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a73c8fed471bc2a15737008b6912f1e SHA-1: 1663477350af482fc40d13f0519d380351bf68ea SHA-256: 94fce7f6fac104c4a7157b581bde0e1ec3a9c553c8f369aa6dbdb716ac22cdf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.gobarging.com/uploads/textareas/file/21623044650.pdf In PDF document text
    • http://rund.cz/UserFiles/File/bovalovowejubetelufe.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907191548.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0209fdcf---kulajuxedefibirino.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320e67cd9a7---28453120560.pdfIn PDF document text
    • https://partnermind.cz/images/files/10149419298.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390dbe08cb7---figaluxegitazepojokap.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/72187326265.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/xibafetunapejuris.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/15712694795.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce4762aff---jegarojonox.pdfIn PDF document text
    • http://armanetti.com/images/84318263555.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210911_0A3D9B1893146D3C.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/bered.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/20213638805.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/79159763404.pdfIn PDF document text
    • http://exosushi.com/uploads/files/2438544943.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c0eb098332fa23788149cdbf7cbc3a34/nipabafolakutis.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/55809718369.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/zozopegumelonirimevuli.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210906073101_rnand6.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/sipewotozubizome.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d475f91afb---95531730300.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/rojemobivujivowozavow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=c%2B%2B+output+questions+with+answers+pdfPDF 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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 10912 bytes
SHA-256: 7b779a05fda13402fae0af8b55eca855c4214192b2044d1d6f327c94b5d9560f
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 18328 bytes
SHA-256: 91d70a0c46801a5f4c2a98ec09ca8203c02e0cfbe005f63d2985cb0cf9df996b

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