Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48346a44a4f269f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 08:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b00d188f67ed50eb7d26634afde09cb SHA-1: 08712b9ce9a2cc1a03eee7fa5119aefcfb41ad30 SHA-256: c48346a44a4f269f215ad90108c02f7e89d18f849346b24424a0a1637401678d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting it's used to redirect users to malicious content. The heuristic firings related to link farms and compromised CMS uploads further support this, indicating a pattern of using these sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=eragon+the+inheritance+cycle+book+1+pdf PDF link annotation
    • https://ajitcoatings.com/uploads/47974155384.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/sikogekunexozolar.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/sirabufapuworalafe.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/74742131294.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/tutijoledazovaral.pdfIn PDF document text
    • https://bselink.com/userfiles/file/fegufuridanutijepi.pdfIn PDF document text
    • https://orrizon.ru/images/file/77990184586.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23624c3264---dasawideloduvukakegile.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5ca99be4---47588436582.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/58336343519.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/90501315786.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/vilesuwisiwebevimi.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/riletuliziwimuzagazepib.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/jukemad.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac52db6653---murasevitazesosewa.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/lukavidugimoniko.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf30e5984---litexosafulazesu.pdfIn PDF document text
    • https://funbugs.ie/files/file/44032145275.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/gl2e68oeas6l07kupc7bfeqrd0/15053206242.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/35201446621.pdfIn PDF document text
    • 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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 11112 bytes
SHA-256: ff090f09c86c88b89f3e45e77d6250a40de6e68c3f030dbcad93d2bac13605b3
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 18000 bytes
SHA-256: 06fa864597f78b7bbcdca970f5e97e0bdc331492e10f150689b41964d58335cb