Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac650acf59035e62…

MALICIOUS

PDF

98.8 KB Created: 2021-08-09 08:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b64e2f4247430832ecfc95eacd4832e1 SHA-1: 400fb4c05db18283519aeb8ae28fef2034c7d0e3 SHA-256: ac650acf59035e625477427e67590dfac96b520680b7e503ae757a28960b1075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload storage and other disposable hosting. The primary purpose appears to be directing users to external, untrusted content, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ikhmongol.mn/ckfinder/userfiles/files/gemakidafo.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087acb9376f1---kotuwiwomixabezonalu.pdf
    • http://foto-preiss.at/upload_files/files/liziguzakegop.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/23813591333.pdf
    • https://bda.ch/ckfinder/userfiles/files/jituveluxepudun.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fa62219d6b08a9b7c0c51367624e3299/25588299604.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb40c7f647---xinutisus.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609276e6d3c08---kinitijopub.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5b4bc1c6b98b512561f9dad2bc6078ac/81533590902.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160933932924e5---filipasuxuxitupe.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d2428617afd---zalegexidudelata.pdf
    • http://paolacaone.eu/userfiles/files/worelalibejinola.pdf
    • http://tfh-filter.hu/_user/file/92760020338.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bhsfhrmd7c6rsnt40ckv212gp1/34584956843.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/579d7696d701f08ee6e551b3f69e596b/fonajelexefa.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ppub4nqdkvid01bh888o1f3cng/48548309369.pdf
    • https://aquafilling.com/userfiles/file/gegudebusizutuzeverakux.pdf
    • https://uleiuri.ro/userfiles/file/rivagotopuwetirerew.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra1jiagb5bdtcbn0mi9q3g0s15/78626848439.pdf
    • http://asbu.net/uploads/FCK_files/file/81442391818.pdf
    • http://stjconsulting.it/userfiles/files/70140455609.pdf
    • http://szguilong.com/userfiles/files/jobofotedalurebofa.pdf
    • http://archi1919.com/smlclub-files/file/xajetut.pdf
    • http://cesurmakina.com/userfiles/file/mutikogegekosulariv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ver+la+tumba+de+las+luciernagas+pelicula+completa+online
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010868.bin
e1553f2e6fe77f0d2f7f5d4f5977749afcc6c4606b3030350267d62e413a330e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 11064 bytes
font_01_sfnt_off000121bb.bin
3fcbf83556b9793547d85e486b22f2db2a8a9c1d54459f6976557d16a1cf371d
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 4380 bytes
font_02_sfnt_off0001326e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 16792 bytes
font_03_sfnt_off00014a80.bin
a931ec3d97fb30163449a7a56f9f1f18aecea78aa872207c0470780424836e24
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A80 18252 bytes