Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf2dd2caf9ce683…

MALICIOUS

PDF

91.3 KB Created: 2021-06-28 03:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2b9315d2c56e1a3a9a0558d464577ea SHA-1: 4ab395beb9c507e6109091087071367392414bc1 SHA-256: 1bf2dd2caf9ce683e33118a4691273f8b34df177b2f7e5f909004fb0a2e96e2c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://crysiq.ru/uplcv?utm_term=east+west+north+south+in+marathi
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b1b0985f---94829255748.pdf
    • http://anhopphat.com/uploads/files/toxotefamiza.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/t9l9431posucchoudm4qe4k8f2/babukevetamitisizijeded.pdf
    • http://prosquash.by/data/11399795097.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af20f4077---59322813186.pdf
    • https://shop-ecobati.com/medias/upload/files/wizosomaxufukavovujesow.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94d091248---28004303230.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671456bcc9---panewekugubarurabegovim.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c08732e3a---dopoma.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/26a3608cd375bc8e8fcb428a085805fc/mewijisip.pdf
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/titerolanazufizoguxiboni.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/2fc69571807ab40ea382b212b808c97e/gaxisekadaxemanadutixikol.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f4989cc354334da45eacb9a0a034261f/nunavaxi.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade494e527d---63719330047.pdf
    • http://www.awakohchang.com/image/upload/File/2938487288.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/fffd83f6e7c8a6de0b6f2b5d12035520/35438598459.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/96e8b1fde1ba92acb55d690482214ce8/96131369968.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a6380fe1---39931480197.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/74d2237ec507504f6fd18574f20b1bf4/19522758499.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ea921dbb---32321073740.pdf
    • http://nandeestationery.com/userfiles/files/tilarura.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/68445141626.pdf
    • http://dieta-plus.pl/userfiles/file/fitewuwezaropomajemew.pdf
    • https://ms01bet.net/contents//files/nenetinomosawotokibox.pdf
    • http://interface-referencement.com/userfiles/file/nidujuluzejuzezojamukigut.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_off000101f7.bin
d3d2ea54418c72c299b023e3d6f352a37daf8a1360f62eb380a09d0139e8c660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 17560 bytes
font_01_sfnt_off0001301f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 16792 bytes
font_02_sfnt_off00014836.bin
125bfde6f56b7bc7f4557f643a9a012f0cc44994803fdd85fa6acebfdb9e9516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14836 10496 bytes

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