Malicious PDF — malware analysis report

Static analysis result for SHA-256 d589625ecb8be866…

MALICIOUS

PDF

61.5 KB Created: 2021-06-17 20:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e8b1b0aba035b408801dbe9744af6800 SHA-1: d920129c85d4d71b760d03ac598e4e71d580b749 SHA-256: d589625ecb8be866a0ecb1cf7b8a702fbcef81974727d83da009c9b43b5ae149
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The embedded content appears to be junk data, suggesting the primary malicious function is through the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7689

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ad36c4b0b51d7a8af268aa37d124028a/59133196556.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609781a122f15---gawojete.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/xarobu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/sirabufapuworalafe.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/aa5d9c43d7123d4d0b02bf82302a7041/26535530347.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/jenixelaga.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d7c5ce2c4fd1148fc9bdb3ce3f8ba02/vebofevopilal.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae96b83bc4---fosimifoloxatanonofobejen.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b061192c30b69b13e5fce7bbd9ab4b2d/lowikuxilupidobojagapika.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a3d59bf6ace1a89bc1c80973d5e9d025/sojixog.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f00db96ee---wojowumawuzekoj.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/mokolevalerujefuluta.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2e7e1f97a612b9b49c8519af5a8b66c1/tibisuruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=head+first+java+10th+edition+pdf+free+downloadPDF link annotation
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 6568 bytes
SHA-256: 2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe

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