Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d26135c9fe94bf…

MALICIOUS

PDF

96.4 KB Created: 2021-09-07 14:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1daec76d92ce9e04aac23629e79c325b SHA-1: 4333f1b877135e76ac0348987f394cc9b28bd660 SHA-256: 71d26135c9fe94bfa9e5af3766abe7f7314cea7e8d1a2177f4cda3a586e34a70
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://clinicoral.com/img/userfiles/files/87620920028.pdf In PDF document text
    • http://iwilldoit.ru/uploads/files/files/vozanadaxizafovojo.pdfIn PDF document text
    • http://isgsrl.it/images/file/bajewuzazajobege.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a359463bc53---disulonenun.pdfIn PDF document text
    • https://lapiadinafelice.it/file/wedamuwuzabivawib.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/76407873201.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/remeligapajalexabexato.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/xavewujelalaraguvatoj.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/15226030942.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/64101257392.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/vazuveka.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/gajodaxamexev.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210614035108.pdfIn PDF document text
    • https://sambelteri.com/contents//files/84385369316.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a63ec51491---53656250121.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af024db36---97213948337.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/80717607934.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/muzaviwarerixova.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081024e236a8---venaxukegos.pdfIn PDF document text
    • https://castel.ro/userfiles/file/sazilesebonexivozitoj.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/94887730056.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/tufupufubitin.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/wiseri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=techniques+de+vente+et+de+prospection+commerciale+pdfPDF 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_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 11160 bytes
SHA-256: f3771f24d875964af1d6125dfd8db3852ec35b466abe410a6885a0c323e4cdd7
font_01_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 21304 bytes
SHA-256: ecf6f2dcd8f8bcf08913e91db12b5f820300a3cb139a1f697c3392e81e6890d1