Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e537ecc7b2756b6…

MALICIOUS

PDF

99.9 KB Created: 2021-06-29 05:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a70749a549a1aa61647fc9b42412c101 SHA-1: 03b36d425f0ad02cb411761dacae175b4729f38b SHA-256: 1e537ecc7b2756b63363f5a7527b0122ce73ec7eda4c216a0a5d41777780fc48
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of a 'download' button lure further suggests an attempt to trick the user into clicking these links. The primary goal appears to be redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b30e067bc1f6b92e08455d886966b408/1703182881.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6489dde65d61a996ebc641f7575d12f4/1161885155.pdf
    • http://phantasos.org/userfiles/file/22531710684.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/10b2a029a14b8caea201373b9623cd39/27762795642.pdf
    • http://zjpjxt.cn/upload/uploadfile/file/75401068624.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0sd5humbudrjllljh6ev1f1hud/35756678101.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2jp76qp2dte80b3asg1l8lvtgj/76452191791.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c30719c420c---jenulitefejamivefe.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/12937880242.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec16f0274---13882706651.pdf
    • http://agiusfuneraldirectors.com/files/file/93550947948.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/aep0t803g06mfne1j7k19svqft/62183572584.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1375b5bf81a40e6187d32b1d105b5e80/58525059296.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ee7ce93b---9625940069.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609448ea88e76---ruguxijineb.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5871cb6d90---69172752939.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9534bd6c---fovewadinari.pdf
    • https://girilawfirm.com/content_files/files/94335050215.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc7bb65e12---nomofixavunobipadoruxu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00223d5365---xesenum.pdf
    • http://waterreducer.cn/d/files/69298771225.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609876829c4dc---23402084816.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/9003693438.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=adobe+cs6+master+collection+crack+free+download
    • 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_off0001200a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 16792 bytes
font_01_sfnt_off0001381c.bin
5d667e039ad72bec908ebcf0efb088d276cdaf51a825b5e182d4253be7af2820
pdf-font-stream PDF embedded font (sfnt) at offset 0x1381C 17732 bytes
font_02_sfnt_off00016699.bin
d76e83c9a11208423eb162ad2d27e8c91df78684aa4195fb5a81e329361ed436
pdf-font-stream PDF embedded font (sfnt) at offset 0x16699 11104 bytes