Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d85cb5bc8dc33e…

MALICIOUS

PDF

84.3 KB Created: 2021-08-18 01:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 655744ae390ff815c50855387d19dbef SHA-1: a184e1a648294b2684697d35c9b5e0a315da3dbb SHA-256: d7d85cb5bc8dc33ed5aa8bf3905f35daaed20914999b47d6ae17ad2dda366614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7632ec67c---temafebinuku.pdf In PDF document text
    • http://tai-group.com/upload/files/46584100335.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/q5u3kbnt9quuke85p3ek723oa4/62824729688.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/zesupixepiwiv.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160727f418d2ef---94897260925.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0de2d40d2---dozomad.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/dutipej.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9405320f6514843358b246af5c902fc6/34429212132.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/55c7bab4311e94f6dbbe62c30cff28d3/86125403760.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/79660960865.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e95f4447c5---dogemapajufodejipuvub.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/gasemaginalifutiwugele.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/37807741252.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/lokuzebazu.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/vokexazuwajekojelagenil.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4b37b4f82---34724416444.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/82941196675.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2571e3b21---wozegawod.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/14796472424.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/tonebifonoximexapeviraviv.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/93701946578.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/28bad5f8233de6b97aa686c921b7a794/24785307090.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/zofajasuduxiw.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/vumusuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=general+chemistry+virtual+lab+titration+simulation+answersPDF 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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 16992 bytes
SHA-256: 8f3a8588d22c7a38a0dad0dda2a3ee5bc0e25a5d5915363138cb2de4ccdd38c1
font_01_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 11040 bytes
SHA-256: 4905b2030db0e93529afe3238d822021a50532e6206963f42151eec0670514ce
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1