Malicious PDF — malware analysis report

Static analysis result for SHA-256 26af46c0ec9e878a…

MALICIOUS

PDF

88.2 KB Created: 2021-08-16 23:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 418b6acd7ddef494a4d801836182bd36 SHA-1: e075ac941180d56f43c4f2e6b92fa29c2a353b77 SHA-256: 26af46c0ec9e878a1e52e8fad5afdf5c64098f97a927e010446f8dc49686854b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1hs8k5oov9bd6sdu0dt46mrqj0/60554407398.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160996cb55133d---penowezusopof.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2891b548e---73826267911.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cbo33utfch0dlti4m99smft3bb/gasobusaworavopasude.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083260465110---filonilinemore.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/suo5vfp3im3mv3j37g3so4k7b8/zetup.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/db03a07e4958f01f2979625bf2f3094a/metupuwajuxasunenitoros.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/lepunarujix.pdf
    • https://flyags.com/editorResources/file///rubeki.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedd22be251---doduxut.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0eace430---70013521862.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/mivupaz.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/270ddpqv3fn5m6erh055v9l4e2/degewop.pdf
    • https://sarvodayasamaj.uk/upload/files/774940267.pdf
    • http://ceskylakros.cz/userfiles/file/78336256538.pdf
    • https://cissud.eu/uploads/ck_editor/files/wugin.pdf
    • http://allmedicus.com/userfiles/file/32340033036.pdf
    • http://rebeccaosborne.com/uploads/489712371.pdf
    • https://livresdarts.com/ckfinder/userfiles/files/milisaketebeberojuwapo.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/suvifuk.pdf
    • http://eastcoastbiker.de/sites/default/files/file/daramekag.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/91017640635.pdf
    • http://ei-windykacja.pl/upload/file/86672865626.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=inventario+de+intereses+vocacionales+y+ocupacionales+casm-83+pdf
    • 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_off0000ec40.bin
c6b332915e78fbd1fa4531f53cb1f0b8a3753422cf025ac4079cad09d8af39ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 19060 bytes
font_01_sfnt_off00011c03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16792 bytes
font_02_sfnt_off0001341a.bin
7218b3ca7d89c1bf540258d23b72ace1939358e1639673dbe0d21eeb70a4974a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 11424 bytes