Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc49e12d198127a…

MALICIOUS

PDF

79.2 KB Created: 2021-07-16 17:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f657e2869212c4908763bfa54cd0628 SHA-1: 976889ef9f868abfa4c0ada525f382570994c642 SHA-256: 6bc49e12d198127ae4db3f9672ac7ec42c29871e8d50f8390ca9d08ca91c303e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS upload storage. The presence of numerous URLs, including those hosted on compromised WordPress sites and disposable domains, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://deurenhanger.nl/userfiles/file/norogutoweta.pdf
    • https://kompaspt1.com/contents//files/daduzufezabitekekivusa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2069b7d07b---fitabaziges.pdf
    • http://anaminfo.com/attachfile/file/nikajozurov.pdf
    • http://spamsmsgiare.com/media/ftp/file/66018748272.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe37a1d6d---xapojajipejutepamul.pdf
    • http://ylplj.com/ckfinder/userfiles/files/3704877827.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a17962f0bab---88848761229.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2db0436e7---wetifavekenakepuzip.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/vozoboxe.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/245b5b2a2902d3df89d8da5c4cf26020/58545677474.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc90b574e---ferutitononapalenoluda.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608987134f53d---89866298940.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d69cf678---71178335668.pdf
    • http://xn--e42bt3l.net/upfile/files/70990417051.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a1452513---vupowalojopuwefofutal.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1e76a058---29506122274.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d006u1f62i32kjfhmrfeouuss3/luvijotufuxekix.pdf
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/15636517538.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0db68c40efc35563c91c5a474f911389/mogetujidopexire.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/559c78f7ff376681ecbda38828684b3f/zedewebomokakovop.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bc07921fe---rawejikorofojulapaxu.pdf
    • https://cottonweb.net/userfiles/file/91955358771.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=into+the+woods+full+musical
    • 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_off0000d1d4.bin
862f0782123e0e763ff3403f7290ef77c680dd822c6f547562c67f6cbe3c0a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 16788 bytes
font_01_sfnt_off0000fd47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 16792 bytes
font_02_sfnt_off0001155e.bin
74328db96e13be7f3830d69e3fa0ad5be290e50d856206a5a74161c3867a68d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 10780 bytes