Malicious PDF — malware analysis report

Static analysis result for SHA-256 de099b8dd948ac75…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 13:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88a263ab99943cc7426fc0bd6ba0b877 SHA-1: 83ea58b462e8eda6a168a493f69d8a68012eff13 SHA-256: de099b8dd948ac75006cf426bb39bad1525429cbd83b2d22b7faeaef714f7f06
196 Risk Score

Malware Insights

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

The file is a PDF that contains heuristics indicating it is a link farm and potentially malicious. Notably, it includes an instruction to disable security software, which is a strong indicator of malicious intent. While no scripts were extracted, the presence of multiple external URLs and the ML classifier's high confidence score suggest this document is designed to lure users into a compromised state, possibly to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://kvbm.org/pds/userfiles/files/96816412324.pdf In PDF document text
    • http://indel.sk/userfiles/file/sovonixawevozanofu.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/gilasanidijimida.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/55969907426.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/3667097.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ad07909b6---tedijujurure.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/9661502531.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/84615509097.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/57956702450.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/fijiro.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e9a48f5f7326e77d75ef9b9af50a5252/xunesovaxisaxogoz.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/81958280142.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/28880281952.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/37625710754.pdfIn PDF document text
    • http://biomehl.com/images/content/files/85736171449.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/29524482206.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-12/20210912165827640652.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/nusexuv.pdfIn PDF document text
    • http://espokebar.com/uploads/files/57596276610.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/47106191422.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/72663075425.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da262865b---gapulag.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/73400436166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=yu+gi+oh+legacy+of+the+duelist+android+apkPDF 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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 18600 bytes
SHA-256: 7cf9f5ebcedc2ba008186ff62d5627d415ae2a564faade596d15f2ca19f822df
font_01_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 11188 bytes
SHA-256: ee70d7ad21a1fe2ccc880bba1628946428ad267a03df3ef220e45aeb25247ed7

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