Malicious PDF — malware analysis report

Static analysis result for SHA-256 8447196bd710b263…

MALICIOUS

PDF

80.2 KB Created: 2021-07-03 12:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bf054b266903c098ae532939e9f6076 SHA-1: dce6da7439c11eb07dcfa4448bc5e59342576fa6 SHA-256: 8447196bd710b26300719aac578c614902e5a2b104a27489788922339804e2a0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the associated URLs are the primary indicators of its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ximangsongthao.com/app/webroot/uploads/files/31590777315.pdf
    • http://skolicka.eu/foto/images/file/lukaxalabiwezozep.pdf
    • http://h-st.nl/bestanden/files/85358502603.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/03ts76ltdpuvrbkq90hqvdp161/6174813391.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed4998e40---67245764567.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d121e4b732d942e416a70d0c6d2dcb1e/tujowif.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4659fb4273b92a4fd45d5ea71e422a40/nudemefolofetedob.pdf
    • https://planet-for-events.de/userfiles/file/52969637002.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f1b5c2653ed0704deac3c59b60b1d3f7/3787663050.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8d72mcfcot7ngs1hcp0r228am1/fejuvumomoxetapipobozimo.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/9690323537.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89af75dbc---reruxilasosotufolorolawan.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c61e554746aef3807c6e1f0fac1c1637/rubivejazunanegifoba.pdf
    • http://allamericannursing.com/userfiles/file/32752730865.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96fc75227---mesagexoruvapegatejol.pdf
    • https://joebalogh.ro/imagini_ws/91735989034.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8tfi36i173vjkarvnb4i0btqef/vevimodupixox.pdf
    • http://patanamachine.com/imgUpload/files/95140689089.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcac8da10---69024465992.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/b84thijj3gdr71hh1sjo71esfd/sifolerugesu.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/44b0df245d5c0e543144dfc0953dadf0/delegode.pdf
    • https://ancoraeducacion.com/images/78512919800.pdf
    • https://anmoul.com/userfiles/file/lenasitepukixe.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/41905357231.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a49b665a45---lajitibej.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/44523390369.pdf
    • http://alexlunacoach.com/img/editor/file/93621025982.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=answers+to+geometry+book
    • 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_off0000d5ef.bin
3394abcdcc11da13f32d947bb317144a6dad67ddf86b33b758f67dda1cb82306
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 16736 bytes
font_01_sfnt_off00010190.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 16792 bytes
font_02_sfnt_off000119a7.bin
b62c6db3e536d65b8c4d2129fa5bbe3e33877cb0c689d188e81af658a74dedde
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 10564 bytes