Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7e2faee17fd423…

MALICIOUS

PDF

85.5 KB Created: 2021-07-19 04:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfc3af0cc2683d49e34e1706cc2c4912 SHA-1: 339d502d0dd80429030cfc5f6842c3d5bbcb9722 SHA-256: 2c7e2faee17fd4230a84004baa0339a08dbabe6628e48ca211197570c2d36e0f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing or to download further malicious payloads.

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/23224820511.pdf
    • http://opusincertum.it/userfiles/files/dasilik.pdf
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/84215749090.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecb22ef45---bapabaduvuma.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210509233204.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2610e4f7f9ef2d5671f47ef678c485cd/15075639541.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2uvbnd2okh4apfgksgqude00jo/81942343793.pdf
    • https://mattress-leader.com/media/tejunoxaruwozenukedelovi.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e90ae0e7c2eae1dd48f5f2d936c8d92e/duwewijoluwafazigujefug.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/takuvixurorakunesekaxibi.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/76160e70660aee651917c6baf42ef59e/71412956401.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9f65b475---vedumidatulekejugarujex.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acacf4781f7---jozuxubaguvujipi.pdf
    • http://wingmanplanningdemo.com/userfiles/files/tenijol.pdf
    • http://krevue.cz/UserFiles/File/54458801214.pdf
    • https://oxi-dental.ro/imagini_ws/kijewomarejulidupavojogi.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca580d8dc8---58798024267.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/lesaxilipalubakugafisedod.pdf
    • http://newabel.com/ckfinder/userfiles/files/13591631571.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/f21b5ed6865ee3736fc0b03db246bdf7/wosusifemogalazefanuxuso.pdf
    • http://lamachine.nl/userfiles/file/41685329941.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a19b2315740c79df6d523b091d6d68a1/69977629234.pdf
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/zegeteluwubiluwagajobip.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/aulbofqfvqfvpgob62gk5nomai/mixelokedo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=official+resignation+email
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 16792 bytes
font_01_sfnt_off0001044d.bin
b3fc97aead469987dca7f37adeb084edc48229a46556907c8b21015aa7f787d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 16844 bytes
font_02_sfnt_off00013027.bin
e65cd0e4fe7cb1b5450b233f04ad222950565ea55140ae8aaca48a4e67a57f16
pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 10704 bytes