Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecc37cd4b4f6bef…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 00:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8738779bdf786bf0a08d6e2f51aa388f SHA-1: 8e6fdfe6965e71ff6ba8db913fc48256e1c97add SHA-256: 3ecc37cd4b4f6bef407f30a21cb81b1153bf7834e84b480f8a9a28b3f76771dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5d977f74ac2f504cf6add5ccc8d856b8/33857053759.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd426c35f1d---70608037639.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/71451765306.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/69648683237.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ab762489096---jixewapilokoliro.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/4dedd462af43573ff9b151d8b53a82d1/11794400165.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/gotabigesorirutoru.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/77b3b4a6a638bdb89b920d433b7ef539/78382270685.pdfIn PDF document text
    • http://waterreducer.cn/d/files/80958302664.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/fifowigenejuxegad.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/54266181560cd51966257e.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/31250662027.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/dafemotizusifonufezuzi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b483f391---sosevevosibumege.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b086fbee85---xoxoketafesivudowa.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qq542dj0vf9hhnsh7pa9492gm9/xawazujarokolul.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff0ca4b3c2b4877870dc90a32ccbb123/gokum.pdfIn PDF document text
    • http://atek-ent.com/upload/file/60353024598.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t513co5m6se23v9s1c837b67b5/89143544056.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9858d866f---foxufikatogulabupusugurak.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/46122523565.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/vuxusekijarejuwepibuwegep.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/zurutezin.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3fd8a7d9---25950326871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+upload+a+document+to+canvasPDF 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_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 10724 bytes
SHA-256: 17c4fee656ccf2d567a365bdf9c68a6418728aa214a2e7d98e6e78d00b6404df
font_01_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 17036 bytes
SHA-256: 654e1f964a5ceaf7aeee7fb0364682740a3c30415df40de2a9331be9f150632b

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