Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df79567aa15f562…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 11:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a81e6565c4e636a3ce32f970b07080f SHA-1: 811580adde5ed96a7e22b31ffd846d3f5b56ce28 SHA-256: 5df79567aa15f562c89588a5e3fa3784ef976d2f214ec86ed5aec12a0c6414e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://marjoyunlar.com/calisma2/files/uploads/jileroxilamem.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8bf0895a2e57ee9e73060b4748082caa/koxagu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b769d08f973---vipizu.pdf
    • http://anandamsanyal.com/userfiles/file/9195999881.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ugl2uq84b2mhbj72sij6u1f45n/91537630436.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b334b7b2d34c566fe54e78e0ea0f0bfd/dilamuwibonagikevane.pdf
    • https://kurtoglumob.com/upload/file/zenajelagijevup.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5ff55d075acb26f2d82f6bf1a9b7bfc4/ravivuzorofakoxuwizexo.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/iegman1c23vksm1darc9eeqkhc/34302943001.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920a15c904f---mawavex.pdf
    • http://pallenberg-busreisen.de/uploads/files/26350945370.pdf
    • http://jdjcnc.com/upfolder/e/files/20210714074605.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f1a6a957c75fda31270380d851553715/22399219574.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xanibizasebis.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608720a70fc5d---17682162632.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a5bdb5861---20939408688.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/43ab66625d31c9b8ad26ce4266a116ac/mumupovupob.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/99411156171.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=alicyclic+and+aromatic
    • 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_off0000b690.bin
a8c21094a7debf948588e41bfcc950151e28efdf7dd8834c3984b51187156b33
pdf-font-stream PDF embedded font (sfnt) at offset 0xB690 15212 bytes
font_01_sfnt_off0000dca5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16792 bytes
font_02_sfnt_off0000f4bc.bin
5ea47f591d0ace5b0d97e0443e962f9b592e6e8d79ceac7fbb43c2538e8a5fc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10328 bytes