Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec49f7f41715a98…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 23:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48669d8adc973d9779420c557aaf084a SHA-1: 76a37ac1fc59ff8b043905a150cd36bf08c0964c SHA-256: 5ec49f7f41715a98c3320c4486690125b6893b5044c7b3da535160162ec986b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many of which point to compromised WordPress uploads or disposable hosting, suggesting a phishing or credential harvesting campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, as these often lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=sebi+grade+a+result+2018+pdf PDF link annotation
    • http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/bolepolemirejivugod.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/1d5bf19c9ff7e2c036c8919bf518c8b1/favakaradobodewuxidon.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/63164752289.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/76821530782.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9480c4a3f---58553195245.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zugepibapalekojuw.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/womigud.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/pozufuruxada.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/relatufavugowibawiniwezow.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c7fff9a2f5a632789436a287690b6059/65125239142.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/nobejofawisoxapesuzatofo.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/60310355685.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/pefafigibarimunojoxiw.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zuradefa.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/degisatunejosixilikozirid.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/94688344229.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/28591906821.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c6b05e67011dcd23bea34c39873b8fd7/22818972338.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a48e9241---fugekemowajolawafa.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/sixizuwunorofaxozamuwufu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e82bfaf12d---49840578095.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totufejomeki.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f6911a771---92857726695.pdfIn PDF document text
    • http://novichiha.ru/pic/file/32985350472.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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 11268 bytes
SHA-256: c4dee89f8661d94da0136221dd86cbf71e565b19d90dec5bc16de6c26994c349
font_02_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 18536 bytes
SHA-256: 9491fc7550b07ba19cf4df9f07a39702f16076945cc85a50fe9ecf6a66ea0f58