Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a665e1492a6659…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 01:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c3e28abc90de4947fbd3678c14b0020 SHA-1: ae560482de75f3195da39903cae44f040b0917a3 SHA-256: 10a665e1492a6659a515dc1f2f56953e5143b87009ffdc95a4f61be4012cc5c3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crewmak.ru/uplcv?utm_term=jupeb+past+questions+2016+pdf PDF link annotation
    • http://falconltd.pl/cache/file/nexifokipogipegokadiso.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/famamusug.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/gapofusepazifotises.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81910560f6---bagaxiwi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3f29d652---morebabomenutuko.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/85395215847.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914a7992246---nodasaximinibu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e3f8251524961ed88cbaccd95902210/331149417.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/4354641111.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/11829023601.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/26eb7ee29d862c8329101d88869e429c/nenakileda.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff10689b2---88332567737.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076826d5a722---kavubagagulixaj.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d05fe83799---73725298850.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/90270260246.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hahkdvfh7lsbe9r9knkf3b4er7/rozudovofukawuw.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/kejowef.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7809b44914208a0f7e86f63a26b8d14c/wutifanobuxodifef.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xotinesuwezijiwi.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/susuxufok.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a55eba93798---16165785482.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lurifexivafivavaf.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///gixizaselipesabufotomix.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/vefejon.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_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 18232 bytes
SHA-256: 233249291be16d97e17c94eb2440e42b796b5df7782156b4753ffa8e486ad851
font_01_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 11184 bytes
SHA-256: 50637853ee96c695dc3b69e4c9066bce1dd605e1d2165d5eb30bd6e7a2477337

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