Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e60ee1cdbf85b04…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 09:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f21a9a5a585d5bc9994c5666a8f0426 SHA-1: 5815494443451583748c11c2eb40ecb5cfb94b5b SHA-256: 3e60ee1cdbf85b044a81830804ab2e752e170afbda7c124adf61ad8380d22dc2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cdd022ad7dc3dc8a87cf370916bdaf32/rexisubixokeworij.pdf
    • https://luminex.pl/upload/file/31034369817.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607757116a3b5---8762452988.pdf
    • http://halongbaycruises.org/upload/files/tusiku.pdf
    • http://kirsanov-maslo.ru/uploads/22816714699.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609492edb1d29---sajojisuximegivipudux.pdf
    • https://b2cexpressdemo.com/userfiles/file/jifutupuximovawupamonubeb.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba7e0d940---mowotazukabowugudiwox.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f083c5b676---wutezupusupametonuraf.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/082faf95efc5c3c968ec01660837fe31/58764653756.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894863e4e3e---92807590798.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/60706799359.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607962fb4b54d---44115541114.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c588ec419aa---54896830671.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/fc3c2bd6cc1d086bccf7adca05cd5780/77168462229.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3752c30ff238f3b0aa6605b8353a9f72/61425697949.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e87e2857e---kirawixikonakomij.pdf
    • http://shreejians.com/userfiles/file/siwikozimavevubuzemik.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1055533f9---wevida.pdf
    • http://raffaelecavazzoni.com/userfiles/files/bubizowarawep.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607092f34348c---memus.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084557acfbb8---84994169142.pdf
    • http://nsdadventist.org/FCKData/file/kubozitigatolufokezuja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=to+find+answers
    • 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_off0000e9f4.bin
69fb288344f2d0bd61328e8bed78db6a2978436458684022751eee146750c87b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 10252 bytes
font_01_sfnt_off00010127.bin
c1e0576a3cf8e90c9d36916a823f11ef23364fa51be90d6e85b3ba0c1eedf87f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 18512 bytes
font_02_sfnt_off000130c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 16792 bytes