Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cd34b15f775945…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 00:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31d640c9cd9e7bc52dcc78280122cec2 SHA-1: 79bbb644ea35ef9c3cb91fa3a4ee909f463c043e SHA-256: e7cd34b15f775945e95da60892acbc97ab20601e53d9741d78cb8abd3f888c62
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hj0ltjha8ujv5jrgg70l0t5g5h/5420422481.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb0001d2d9---wozeruxevelojawabisuwa.pdf
    • http://tvkinter.com/file_media/file_image/file/5474050922.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8982ef9d03a118d40127f5ac7da5a27d/zakigibowode.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e8e774577---42281416194.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dab430e9ff0969e4efdceb3fa133f24b/72390218591.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d429532e---fojukufebi.pdf
    • http://aliotoconsulting.com/clients/862286/File/85534629598.pdf
    • http://primaneighbors.com/userimages/wodipireka.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6dsh36muv276pih7dnnddnld2/13278160536.pdf
    • http://ahchala.com/img/file/36705824331.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160947403de7b2---voxupalapifugarepidiz.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c669463d---purekofenofunumaliwesigox.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-10/20210610123231990096.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f52e63a7---62261597232.pdf
    • https://prosaison.fr/userfiles/files/51041099030.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/23107b07554c04c5814c5b1e48ec8bf7/45169105954.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0841d1277458de6ff89453d029fb8228/somasegakojonamoxabiw.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/982693702ec02ec2674dbe78e5f090b5/85666707385.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/174849t2f45hvv3ssgj8fnjqh5/dakigolufivepinivukinisem.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b111039abff---rilidililegiwokafajok.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/m34u1aq1ul9ae5h5aska3dak75/62140305669.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=after+effects+premiere+pro
    • 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_off0000e827.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 16792 bytes
font_01_sfnt_off00010039.bin
15e8589ba5c5f4190a307ecd06cbc8f36f131616f6f0368f07bd5b16f309f63e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 17184 bytes
font_02_sfnt_off00012d17.bin
d56e11bc922479f6ea7b0c82bce2bc041c3701a1c6907aefb423c284b704346c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 10308 bytes