Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c64af83e0f5cd5…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 00:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dd1cee419e6b882c240c2085ead7339 SHA-1: 7c68678bb8a5ba1709430c85a0cef3a0d818d07d SHA-256: 24c64af83e0f5cd573162609164d9d9fdf1a58fcc708d0b14af8f91421d28aec
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 potentially compromised websites, including one hosted on a compromised WordPress upload directory. The PDF structure and embedded URLs suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/kupemuzefufavajigafekuwo.pdf
    • http://beautifulmoda.com/userfiles/files/21971589628.pdf
    • https://esperanzadeavila.com/fotos/file/81642323814.pdf
    • https://www.idd.no/ckfinder/userfiles/files/69148353480.pdf
    • http://3suntech.com/UploadFile/file/20210628123534901.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd9cab295---fonexiwekemotu.pdf
    • http://xiaohecollege.com/d/files/domefopevorenobi.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b97e89af3---88107605929.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078cace90cbe---lewofezufelezuvuves.pdf
    • https://hgb.se/filer/file/negogisibalar.pdf
    • https://srinivasagroup.com/ci/userfiles/files/5806603614.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cbe238b8---52092500615.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dae5cd7b0797c58676688e0a74b4948d/67591580684.pdf
    • http://campfirewtx.org/userfiles/file/vemezakupetexa.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1efa98e82eba23a52cd3f6bd71c204dc/meziwukujo.pdf
    • http://ebd.su/UFD/7623/files/xegomuvitinifoza.pdf
    • https://syntellect.ru/Repository/file/72975308606.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609475a766777---refim.pdf
    • http://kibbkw.com/uploads/file/87315731501.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/kojezukopegosumawe.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/satolegogibipipulu.pdf
    • http://cnmrobotics.com/files/files/48721164337.pdf
    • http://apple888.vn/luutru/files/turovufinomalubufiribiw.pdf
    • http://cedarvalekansas.com/clients/875954/File/6071911822.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3b052513---doraxoliked.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=virtual+learning+comments+for+report+cards
    • 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_off0000c631.bin
a4432fb5f855f8e456eecb82e6e75602ae5b41c7e56e448850a5a2fe703c4316
pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 11032 bytes
font_01_sfnt_off0000dfaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 16792 bytes
font_02_sfnt_off0000f7c1.bin
e2ea626e12d682623bf620ff0e193bbbe9ff4f7a798faa58812e62b27e78f7a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16072 bytes