Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db9692c42d0fb81…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 06:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85530884279a39ef59894e10d8793005 SHA-1: 23481942d7f054d51f1bbaea7cd4b4f8437c9a63 SHA-256: 0db9692c42d0fb81b374f8955c9ee22feb0652d0ad469db60970bc38fbd26fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format and the nature of the links imply potential for JavaScript execution or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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 https://eurosan.pl/user_images/file/paxopagejidutekawodijo.pdf In PDF document text
    • http://ibconsulting.it/userfiles/files/pukigizebu.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/27639001407.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/97618953031.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/vatofixokagutitoguderu.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/86747224301.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021dcb80db---topugeguvepusexax.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/72408025532.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/zogodigusogirorazupop.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/balogujujida.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a3e12b5c78---55946898159.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/vulafesitipomunigara.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/11335705823.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/57358085196.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/xewalin.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/bagete.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rvsd7h5ppg7b294m5sn1337tn6/deboxe.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/zodoboziwilopinezizigele.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/2605505218.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///41200154887.pdfIn PDF document text
    • https://binhvi.com/upload/files/74976399908.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a37ee5a8c---sojofipolezu.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/vodirejubopumadivagib.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/20509342501.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/69181959579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=acls+vtach+protocolPDF 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_off0000b10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10C 10188 bytes
SHA-256: 8c0dcd5bc88cbab469d5d9aada77558168dac78ecdc2ba661f052b64c57781ae
font_01_sfnt_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 15320 bytes
SHA-256: cc52fa7ca3c6b9bd632c116b2290950e4bafdcca8eba8d0856741e70ae0b254a
font_02_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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