Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d526a0c0945d2ab…

MALICIOUS

PDF

78.8 KB Created: 2021-06-30 08:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83b15d5940c81dc6f6d29539620ff60d SHA-1: 66af8c5cb9aeda0e5f66d7ca28cc20c0e471e500 SHA-256: 1d526a0c0945d2abf814a12008272d395213b2dca1246d72cd52a5b0eaf59085
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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 http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548831f816---5495454014.pdf
    • http://obchodsezlatem.cz/upload/files/kaginorebapoxo.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad3fe44af5911a0445ec0e7e899ab93d/15217328005.pdf
    • http://jandenzobv.com/image_uploads/file/dadogojibefevefil.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b6bd834b2e2b88f4aacbf344920fbb6c/saruvomiwixajimitemobudo.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607beadbb48fb---ferebopijolizironewisuju.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/iehobr6g1s7ca8acjj4s691van/76589044335.pdf
    • https://avenue102.com/uploads/file/dujeronibabare.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/bb08d656e527923fc313534dfdbcf966/50663316498.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f768173---51900728096.pdf
    • https://digireg.pl/upload/nijemabevogefodizar.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/zolujakuminu.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea25c18b1b---deriz.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5a02fcd1ac735bb86c5327803c5b844b/48300281917.pdf
    • http://knuhpharm.kr/userfiles/file/20210619193819.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/bc90f9919602dabc51ed012d163d2db4/2065549568.pdf
    • http://aldo-ins.com/userfiles/file/fepeto.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d547b17b7---4447947740.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/33501535679.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b8c69822187f5e57bcabab7577e436e0/wutanerafavawotogawavek.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f1086e841---vivexipejuximufejiveleteg.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bd5a09cf---98567254247.pdf
    • https://kartplast.com/resimler/files/19387545497.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083381a91b16---kesabalunixibujetidave.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076bfec90204---banusedeniwemaxibojafizir.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4afc51afa3e948d9d58f4cb7fc8cac78/soxojifo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+cardio+for+hip+pain
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d269.bin
5931c7ca49290988e2b22a22f1d71daa3b222d874e03e0014d2c2d85ec924bc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 15996 bytes
font_01_sfnt_off0000fb8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 16792 bytes
font_02_sfnt_off000113a4.bin
631e5f4508e44415ce8c5510b089b9bc60b8252f9240db0bc07ecb8ddfad3574
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 10724 bytes