Malicious PDF — malware analysis report

Static analysis result for SHA-256 08602169b24283d5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 09:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: aa13d079bd41dea48e122ff8bdf7751b SHA-1: 0bc1c7617776416f0178ea07f6463d7ea10373a0 SHA-256: 08602169b24283d5592ca0116bcfd95986d8650af22c56443e76946ff1e84275
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document's content, though obfuscated, suggests a lure for remote-support tools, a common tactic to gain unauthorized access. Embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, further support the malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://soeurs-scjboran.fr/soeurs/upload/files/36569619161.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362ca17a30f---dutadi.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/80084201431.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109151534488678.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/26372296620.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/83216760306.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/gozuzusiw.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/dobozewametidelun.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/52090365426.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/38772369782.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/59739949449.pdfIn PDF document text
    • http://skene.es/userfiles/file/vepiximixafejawivejal.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/sasolatufalikibijolu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fff8bf601b1a2cc023b552422363ec5f/wafimerijifukilanomaniti.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161424bcadc0f2---86267869854.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/devuwikovozefumawutir.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/xeguni.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tobel.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/xetozinipewazibi.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/serijenabijoze.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/43566453508.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kadaxizadozibupal.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/88275844697.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/kibowanusabed.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/sufisikepavozenarafar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=single+player+gun+gamesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 17116 bytes
SHA-256: 5ecd75545240cf4211ecee987d18d3139a3be3a27d939c0be46aeb789ba47f0c
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 10664 bytes
SHA-256: 529ccb95af39d4503eae91e6e29881bbeea9568af6887c3f3cd47d149654319a

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