Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3506bf5cf720dea…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 16:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e86b68be57eb5c9e2139cc9a3d281daa SHA-1: b85e02a95e2b8bdfd67d9277ed849e6a73f3fc6b SHA-256: d3506bf5cf720deabb31a766e7c21095c133034d23c545b798ba87456be563e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bakoca.hu/files/file/76681435182.pdf In PDF document text
    • http://desushibar.com/userfiles/file/wesubovadukukis.pdfIn PDF document text
    • https://arerp.kr/data/file///6459706713.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01a9fe8072---migifigiramozetolefebaw.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/77665251984.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/842d06bb981bf63a71a12fe66d1758ad/87036264371.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/40ed8b49e0403c0f97e1c082224ed853/ruvefad.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6dc5d05fb024cabcf25ea0abb51d3c49/87125165015.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/xules.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f82fc0ac028---22545888613.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d1695a56a47f98c4f9317b8dd57d0653/fukojirijonokazov.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/jevepum.pdfIn PDF document text
    • http://kustari.net/userfiles/file/57306441603.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/lurewu.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/tulidigilepaxekobaludumap.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/1784695422.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/xojuwimujirulefepidunovo.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/86027661421.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/k6p086magukjj9prss23k13gl0/33365147863.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/zomowax.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f047df42---xalevukivozutibuxef.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/60002364964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=summertime+blues+brian+setzer+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_off0000c683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 16584 bytes
SHA-256: e2afd0ee0003a0aecd3359c8c9707d1caefd2a7898585dcc2bbeffbd3f857bdb
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10916 bytes
SHA-256: 17803c3a6db8603c6511c2a3d8f9199451b3c4bd7dbb52968f1a46ee613ed747
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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