Malicious PDF — malware analysis report

Static analysis result for SHA-256 0445b6813214ee6f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 03:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b72dbcfe1e848d393a588e8c6914e3d9 SHA-1: 44a72a4e805c4856c62fbdf24924f8392f6c2cd7 SHA-256: 0445b6813214ee6f5a595106dfb00253aea711e0010d19e8985e1dfe98f7f2fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malicious content or providing sensitive information. The structure suggests a link farm designed for SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=where+can+i+download+english+movies+for+free PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613730b6f3899---42505331226.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de44b52a40---38913038278.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/leguvakegeratubomitame.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/mejikevinemego.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/xubitivow.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/dupoxexalemomujumido.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1dcf0d741b6bfc1fb2b281ebe52c435a/9070744249.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/fivalegujevunaniririsa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f655nv36t3o44ltfbptq5c9fc0/46942651939.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/16779934404.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/24013250990.pdfIn PDF document text
    • https://12shio1.com/contents/files/43116908864.pdfIn PDF document text
    • http://horvathortho.hu/tmp/nazoxafobewezalap.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/56790496575.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/28631884502.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jetuvirirawomikuwuzufusu.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/35050857165.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/31776449378.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/xiderujisenodoputuzu.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///90479738126.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/73395655418.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/38073812291.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/59075180025.pdfIn PDF document text
    • 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_off0000bf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF73 16500 bytes
SHA-256: 5043ab17af661077ccd2e1e96ed2a5b7fb012e509ea7969b350d42da9cfbea6a
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10968 bytes
SHA-256: c934203235056758e3cdf0c2c381c9391bf37981027c00efbfb480851d63c81d
font_02_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1