Malicious PDF — malware analysis report

Static analysis result for SHA-256 72eae736f85d30f7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 14:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87e50572f9ee93d83a97e0f6d87e7f1b SHA-1: cf05d2e6fd04f2d30e4905a2c42270fb03e53cfc SHA-256: 72eae736f85d30f7ddaff05083ba0c0d19d496dd00e912b406e15ac101f19e94
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest an attempt to direct users to malicious content or phishing pages, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.espaciocultivarte.com/ckfinder/userfiles/files/2549718675.pdf
    • http://www.gdchgs.com/admin/img/files/vixexelamobunitowazakik.pdf
    • https://eetravel.net/file/morepobovu.pdf
    • https://demircanticaret.com/userfiles/file/gugesometitoripaf.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73c4ea48e---96576985796.pdf
    • http://lenosada.sk/editor_uploads/files/27573770489.pdf
    • http://www.fonfe.com/uploads/files/7131493409.pdf
    • https://panoramabyty.cz/content/87520775523.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/45237453540.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5067a9c5566f234ab1ab88d676228878/zuwuvuxebaxukuvitefisidar.pdf
    • https://thaiahpa.com/flash/files/92095222981.pdf
    • http://asvpp.fr/pdf/wanudigojateziwapiguzefa.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d53b2b1ac81f0ec61dd98fad3dcb04b5/perugodetajuvakutifijen.pdf
    • http://ippinnudon.com/uploads/files/dakinakisavoxada.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2ilkhj450kac7edct4272sss75/fimukebakoxigufavoliv.pdf
    • http://parikshitconstruction.com/uploads/27140282792.pdf
    • http://alnadaoil.com/userfiles/file/87932087043.pdf
    • http://euredit-editions.com/userfiles/file/kipojizofugijasowepu.pdf
    • https://toananhmedical.com/uploads/files/nasekovelosa.pdf
    • http://mylodge-naoshima.com/images/blog/file/timigodowokirigo.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/18781bded33058089d8fdf3e54b3a912/paxikejidelovawavula.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/wudobusolapufegolu.pdf
    • https://k85shj16h-561lt.com/contents/files/bapidonijo.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9371f0d56---xoxidijudajutaramukawuno.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329dfc38576---kawixivilelow.pdf
    • http://acelybio.com/upload/files/zisujoteg.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cca56d909465c5ab5b385b5376c953c7/rusuxowemizumekifaguv.pdf
    • https://agrando.cz/files/file/19719480945.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=list+of+smartphone+operating+systems
    • 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_off0000e73c.bin
4349c5518c6dfb2df886065fd04f555ff2892f1f866f86585d014cb8694adbac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 17496 bytes
font_01_sfnt_off000114b4.bin
8fb139052b8fd09ab7d610b0c4e47f5c41de2b351ae491626c47ed67359db16e
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 10828 bytes
font_02_sfnt_off00012d8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 16792 bytes