Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79d9c0cc043165d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 19:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07a753f3b84434f2766cd5895b3aeaff SHA-1: 918271c6186506da01375726db58e6f61603570b SHA-256: c79d9c0cc043165d96da67937d2988e6a330f8e673d3d4d8e35285df269aa79f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a phishing or spam campaign, evidenced by numerous links pointing to external websites. Many of these links are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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
  • 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://resicolor.com/upload/files/87674258802.pdf In PDF document text
    • https://universal4shipping.net/userfiles/file/26248058707.pdfIn PDF document text
    • http://eko-uklid.com/files/file/53880905627.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420eda2bc89---kubazutawunovunoxibot.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfd06797b---tamavejuzezukusoluwuzo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3dcd9d80---43288957720.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/pararuwelosowofasod.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s3s3nk418fm4d71c1pij1lqd32/zituvatufalazobipo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fcb1b891---69861882714.pdfIn PDF document text
    • https://il-gusto.com/images/file/12820584062.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/26067121350.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/pozajevogesur.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/90787778052.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a06518698---68973879910.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/kopuxo.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/22145163166.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/7755055588.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161355f047ee60---34421970321.pdfIn PDF document text
    • http://woykoff.hu/upload/file/56323357322.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/dipisibamuwiz.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ighkfp7f2pjr9p0odp65dkt110/53987566363.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/81901813007.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/38144220047.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/50412691010.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/9749937210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+galaxy+s4+phones+4+uPDF 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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 17696 bytes
SHA-256: 5ef932446b40c188d0320b64e82178577083b0f9eaba49787f7889bdb180e371
font_01_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 10876 bytes
SHA-256: 351caf5a58aaa000357834f7bde2488e07fdfacf2fdc29ab0ed3f8d510f5f2f2

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