Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c63ef638e86c900…

MALICIOUS

PDF

68.1 KB Created: 2021-09-18 02:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 494287dd5ebd8a6f03c22a327679a3dd SHA-1: abdda1bc4b4fd8626f442375e4d26d5fe97a828a SHA-256: 6c63ef638e86c9003fbd2f37804a9157092b28bd700e9727d822b5b5b9613f73
134 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, which is a common technique for delivering malicious payloads. The numerous external URIs, many pointing to compromised WordPress sites and link farms, suggest an attempt to redirect users to malicious content or downloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file, likely acting as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1818

Heuristics 7

  • 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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=vpn+pro+apk+cracked PDF link annotation
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f61b36e50af85a896774190a3f64fdb2/lebokofakopitojuxizu.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/fopibibin.pdfIn PDF document text
    • http://farmina.ru/uploads/files/4261586737.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451300ee27d---xemebobizoguwol.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/fexamijebamozalak.pdfIn PDF document text
    • http://hexindechem.com/upload/files/62142390534.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/64005485553.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16145037f300c4---17546979148.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/99039105825.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c05868fd8---tajenogowizegif.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/lupojajanudifanu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144da04823c3---kixobupotuwomoduj.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/47229863493.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/89291419642.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/xiginub.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/42043061884.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/20084756998.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/40147433484.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/9125631567.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/93dc620ee20fc4b75e0aa88ee1f6adde/josovapiwimesupevotubo.pdfIn PDF document text
    • http://aa-nusd.jp/wonidoreso.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/povodelef.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/30a30a2c360bfb0f1cd99b00e022cf84/71688027231.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/bitivevimur.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/5846147309.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/jilekatogokadem.pdfIn 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_off0000b574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB574 10164 bytes
SHA-256: 15e4ae68631f80c69c957f2425eab75703fc5a14e8d23fd6e669c50fb34201dc
font_01_sfnt_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 15956 bytes
SHA-256: 1d9f03cddbebc8681dd86fe885593997c674d925a39d317a25e91c01cf2233ea
font_02_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1