Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a5caa7719dfd7a…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 10:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e10b45076165b1778f4e960620793d5 SHA-1: ff0f0a66353593e570b9665153c936ef3d80c41a SHA-256: 56a5caa7719dfd7aa2e3c18b7e51e32f30c8be5d83dc5e10d63a9c4e01de2141
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple distinct hosts and the use of 'utm_term=download' in one URL suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ri3hhl1b1q34a2qnp1g593bvm0/16561152814.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4ef55b6c---kabuwoxifebazunutemapabav.pdf
    • http://duda-tech.pl/dudatech/upload/file/67665617756.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608285d0df3bc---85609098971.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ad3754ca825862a96cc85610609c49b0/71325625502.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99084c800---fekituba.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4a61jgd6l7mtud0u4kegjrbeg4/66290487172.pdf
    • http://erex.hu/upload/file/peniwotisexosumoj.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1g6sb6gtt2uiuq1e42j3dgcpp4/85365743156.pdf
    • http://boisehighclassof1965.com/clients/879780/File/73934799978.pdf
    • http://jevades.com/aircraft/fckimages/file/69914540372.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e157e586---luledijupute.pdf
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/26729237085.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/80938590204.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f6dlc9argdj8gen415eg5f5nl4/96091469820.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/j4tpnft2esapt2vn459264bf1c/dorosijolokelufifejiwub.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df1c3dd0e---koxuteredenojonumew.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/14356804777.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/669d621n6jn622labvrkcak9f1/53148093698.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/13d90d3f7310e79d28af8562ae1a52fe/39780527960.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/7k4u2po994taqdkvbldicek4us/rovekamefas.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a019a241a---97934444167.pdf
    • http://fittbikese.hu/files/file/76987699679.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608364c5d20cf---futekoxexepule.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608590b3ca346---6452737753.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+movies+apk+2020
    • 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_off0000f530.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 16792 bytes
font_01_sfnt_off00010d42.bin
271884b8ac87b4654b76c0bc48a9ffbfb430799a573aebc3c1cb17cad57d9789
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 16860 bytes
font_02_sfnt_off0001393a.bin
34edf05e3772812fed16c104a4800d1b9937209bd84e3da367544d50d10016ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 10844 bytes