Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c09e418cf0d3f8…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 14:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0531515d2f911eea2e3da9c333f78b85 SHA-1: 168077749aa7aa6f0c85d9002d9394d0902b20ca SHA-256: 58c09e418cf0d3f8688b1859aef7443a0043c1c2431afb312148df707af7ad18
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute further malware. The presence of these links and the overall structure strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://metabolit-plus.ru/files/file/motadisukedawijikew.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf4f68bb1---megonugesadalowoki.pdf
    • http://ehoron21.mn/uploads/files/42502411531.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080abc9a23db---69706335291.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/nccervi90egbfksta008albrq4/wujuposelebadowetubugad.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160874a971c900---levigasixesikal.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b821098c421---22436099406.pdf
    • https://isleo.com/i_photos/file/22579126760.pdf
    • https://tolgyesvolgy.hu/userfiles/file/71473924937.pdf
    • https://cvsc.co/userfiles/file/patamew.pdf
    • http://thephinhmienbac.com/upload/files/mokawulijopines.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceeaf7b9ac---64607484309.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5cd23a27a811f60a7d1383a43d257ce2/64567049138.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b167dd397a0---duzelopizasebero.pdf
    • http://caopump.com/admin/userfiles/file/4183117515.pdf
    • http://botosani.ro/img/uploads/file/dogajizubuworazutowura.pdf
    • http://bronia.org/userfiles/file/dijugamoromimujomi.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca4045a4e---xusonaweb.pdf
    • https://nhanloc.net/userfiles/file/40286301103.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e553c87286fa67695db7e1f920c1a7b2/vozugobureguziket.pdf
    • http://czpohledavky.cz/userfiles/files/83207977609.pdf
    • https://dp-engineers.com/admin/userfiles/file/manukuvub.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/97331870236.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=solved+problems+in+laser+physics+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_off0000e959.bin
774bd725a5d0280a54f627fe106e9c53f7f5c4c189ce6b5b6896449b7b2ba648
pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 11184 bytes
font_01_sfnt_off00010311.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
font_02_sfnt_off00011b23.bin
2ea11e8fbdd5b7d69f4602d1765c6e643c2fb52f6b04e52f4a838b6ee4c3dd10
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 17532 bytes