Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cd601f932f97b2…

MALICIOUS

PDF

85.8 KB Created: 2021-10-05 18:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa281e23cf5055d0cc55fb62a85bb44f SHA-1: 941e859b4027f9598dad567f9f39ae16d56ce57c SHA-256: e0cd601f932f97b21a61c61f45adaca796e2e2e7ad9dd86fbe182473fd378812
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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
  • 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 https://activepymes.com/pub/file/kuvimuwug.pdf In PDF document text
    • http://tuclubcr.com/campannas/file/62759105168.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/lakutixomoso.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/16332409446.pdfIn PDF document text
    • http://erdbau-rauch.at/35121279978.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/talaxapesijenobisap.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/68544761520.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241409f30c---49656774198.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/boginexifopaz.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/jamabilubukisalitoz.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/44928535267.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bbe4273206a8364cbc9d76d22cd540eb/39147295853.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/mitezemufinumaguwevatet.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615a895b60e34---xutawiku.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109230151242858.pdfIn PDF document text
    • http://enricobarraco.com/files/tepemufodafebodap.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/32497771103.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20211004_0DFEEAA1124E4A7F.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/wemuke.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/xadupefizirodire.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/64673586329.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16153d911b4e3b---64484488083.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/dopazopuwobo.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/47778087641.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/wuviseguluzegatitumaxodi.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/4759548005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=baby+songs+sing+together+vhsPDF 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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 10716 bytes
SHA-256: 1d37fb0e37ce48c11349fee8f90714ed30583b99cea05fafbceb630d4d8bc0ec
font_01_sfnt_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 19956 bytes
SHA-256: 344a56e951e4ce522ebf225d77573f15b71ffd12a2f07506bdbc8e36151bd82d
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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