Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dcd74164671b1f…

MALICIOUS

PDF

93.9 KB Created: 2021-06-29 00:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bfde529221a89fd70016a423f8c0aac SHA-1: bd0725f9e851ae9cc03da211fb9f021fc39dfc2e SHA-256: b0dcd74164671b1ffdc4fc02e73c44acb6a4c4c0c263a32d52c14606b9057139
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to leverage these sites for malicious distribution or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9528

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aymfly.com/aym_image/files/42282088867.pdf
    • http://bright-mineral.com/uploadfile/file/2021052804032883.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1e3c90e2f4abeefdc669c1967b520d0b/kufirujumesep.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/luliwirumunukaruferit.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qrq7od9psjvft4a7a6o5ujtsfb/bolabudidivugakikorik.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/ff2fd7f5218357dcd25f05fb1b240db5/kifefotuxaxuwexibutevi.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ec2ed3d2---38157396343.pdf
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/f282e0b35c2051c0780d755e1446ff10/mamanonuxo.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b16370db---goruzefudesarixozopavis.pdf
    • http://klassn.com/ckfinder/userfiles/files/14289867498.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4cbc63a691b6767bb0ccf2d7d058bf47/wuvelumo.pdf
    • https://soechi.com/userfiles/file/maderenadim.pdf
    • http://absolutelyneon.com/userfiles/file/75531284899.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5eb963d8e---18249437302.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5bca2030d8d55ba03739bae9b7b87712/sosamolito.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vaj21j4sdm3gh45e7st96lgdrk/875248899.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/nelejijima.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67d734fe8---51567655867.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c65a40dd6a8---malov.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/41922355681.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/650f9974fdf172212c139e64220f6872/vubakojumuzi.pdf
    • http://beateromer.com/bilder/file/44590172158.pdf
    • http://fixafilm.se/userfiles/file/87872275500.pdf
    • http://argyleliquidations.com/userfiles/files/67874307593.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7eaa75588---xijadu.pdf
    • https://susta.vn/userfiles/file/sajoxurumagonolepivo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+meaning+of+cunning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b3.bin
192cf180cce49478537cb296b826eb52fad4c6b172f1001c1aa22ae4c636c734
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 20728 bytes
font_01_sfnt_off000116d7.bin
52a6138d7ad96544473ec3d986422e8b05848babec736e61a4dc1cb9a47dc465
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 16452 bytes
font_02_sfnt_off00012db8.bin
d5529f52c0ef22213e409547e34e3b2c83a50a35a729d899a7e18207f610de48
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 2528 bytes
font_03_sfnt_off00013863.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 16792 bytes
font_04_sfnt_off0001507a.bin
2f6573e5d665f98da44cffd87282c9602a8d1bca3c32b261e4659193d3cba089
pdf-font-stream PDF embedded font (sfnt) at offset 0x1507A 10436 bytes