Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0297aff25a93ca0…

MALICIOUS

PDF

71.6 KB Created: 2021-08-22 13:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fb73a0a319fbc72c437c5f1b4f490e43 SHA-1: 0b92e01f73abd9f6402821194ade40c25ba796f9 SHA-256: d0297aff25a93ca063e9730ca942b750e0ee70e02886fe231476de95e51914b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aslimitada.com/userfiles/file/jifekotokim.pdf In PDF document text
    • http://mxm-hosting.nl/img/editor/file/82022795887.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/lilatelav.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/25352465721.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/gabuve.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d2afe3cc3---89546454262.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/60807437527.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f1c1bde9---80667745537.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/bisuxatajefuxuxov.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/kodadurabepotuxasoges.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/paferuvivejomi.pdfIn PDF document text
    • https://irantruck.ir/data/file/wenim.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/26953290799.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/vaxarukutuwagukujiku.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/45789063339.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae299e89373---xelelapaluradosigeso.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/48418417182.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cf9fde56a616a153c918d78f299c161a/94856084800.pdfIn PDF document text
    • https://ntc-container.com/upload/files/mosonex.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/resamotepujutiwigilu.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/timemef.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/42606957224.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2b3uj5as9hvbkkgh1rdi1v5pkj/pimidesifudekukekazofori.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e263437d42299bc29cc17b4dc4292aa1/rabiwaxepedidi.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/79782614177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sociology+by+cn+shankar+rao+pdfPDF 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_off0000b79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79A 15456 bytes
SHA-256: a00eb33f8dc366540b04e152fe471b544a08060512de551a6f8799048c5baade
font_01_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 11088 bytes
SHA-256: d55259294c88684dea83e329959651cfb1090f3209c7c9cf070eb8eb50205db1
font_02_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1