Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f4ee711274bdee…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 03:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28997706bedd7d1ab52f1d5bf2cd0bbb SHA-1: 40524cdc4ea876f5e77a49ed87ce08998044f457 SHA-256: 92f4ee711274bdee16fc4e368429c07f1f3ee7c977f92cccd6cd6612027ce559
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm and compromised CMS uploads points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=breaking+into+pieces+synonym PDF link annotation
    • http://ptaki.info/imgekoprojekty/files/lidibitaxexejolusodax.pdfIn PDF document text
    • https://fultoys.com/userfiles/59354458160.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/zimekiwilozu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080f60834f4a---deseguxivatoganuriguj.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/defabuzumedelarokegipiv.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/9d128318686de8df08c98d1b1104d510/22802099714.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210630125454.pdfIn PDF document text
    • http://atomleasing.ru/media/File/78302564021.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/lexegara.pdfIn PDF document text
    • https://sambelteri.com/contents/files/75816622185.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/9653299167.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/raretoxoduxenagevem.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc53a4145ac---gexerogukijunemipex.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/580dc82f41c708a21f323269c47351b9/lanisajobadalubo.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zojerefurekej.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1344269f2a05df71af3c41dfd45436e6/75238292301.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d4946e4ad---37569689429.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde6f214992---78839992387.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/65399788696.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/97c758ac834d0a9c4489270ab342f2a8/43368307662.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/55351586290.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/savofomitupapitoxoxefejo.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/wuxat.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752ab209904---53852713005.pdfIn PDF document text
    • http://merwepizza.com/upload/file/jirodewafipowaxumibuvud.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_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 16656 bytes
SHA-256: 0c9ceec3f8aea2f64db08b42366612b47f0ea961868a75a55bd5c80885282d5e
font_01_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001367f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 10928 bytes
SHA-256: b07bbc7203cc00729aa9d61834915ec9678734b9c0e218192742e80ea8b08e7b

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