Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe744c5d96169fae…

MALICIOUS

PDF

94.7 KB Created: 2021-09-21 04:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c65bd424ff352a3826540fb404bb6d1 SHA-1: 7b9db7c09c5d6e843104b949a412f02ed15fa688 SHA-256: fe744c5d96169fae0ac071e950e472899df5e45bf3c8f53538e1d7bd2ee50150
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external PDFs hosted on various domains, many of which appear to be disposable or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://catamma.ru/uplcv?utm_term=gloud+games+apk+premium PDF link annotation
    • http://jshtextile.com/UserFiles/file///dukeda.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/sepitoravonalir.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/kujudupevunogosomakudo.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/jufadoxud.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/xudagedafuvugodiwanu.pdfIn PDF document text
    • http://techmechengineers.com/uploads/72580550160.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/62951388348.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161492c4c833a4---35837144088.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/zalizuxepolawexadezire.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/77684441536.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312065452319.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/95650955659.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/dawiferigobutajaxidi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a1usgg7mvqnhsjovmho7t7uhdl/revoserufifakonixufaripu.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/49049669349.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/delodajok.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/944b060ad9fc0d246ed562c5671340de/zixozomapid.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/86619894268.pdfIn PDF document text
    • http://hongdacable.com/d/files/84023844194.pdfIn PDF document text
    • http://labotinnghia.com/img/files/55548024904.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/38052852007.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb26c9994---83319989686.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/wiguketexeviwiwije.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 18244 bytes
SHA-256: 99858d95c0b8349bf2a2ae8fa08e53c0d15f6d478e2d8fd9c266ee083ca52f21
font_02_sfnt_off00013a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9A 10764 bytes
SHA-256: e3612af5ec216c03c6bc4910337517cbc9abca812b04c6925fb97593e64f0a64
font_03_sfnt_off00015328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15328 17308 bytes
SHA-256: 59e194ef199f2d8d3561d830ac47e39b9b6c32126233ce4757b151da62c21723

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