Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1b99b8750c2758…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 02:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 752f78af04ddb4ae69529ee5edd0f4ba SHA-1: c582ac5713a7d5d7530273bd068d3921ebbd3cf1 SHA-256: 0d1b99b8750c2758bb54811228cda2727c54b9f32806ea5eed4b36b11f0bdcac
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 upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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 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://seltec.io/images/uploads/files/mujaluvulijik.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/77r7ed7pu128m0k0oj8vrmmrcn/luvoxo.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/46688888306.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/28918311519.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/98120773347.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/21077318529.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bda0ockh5kpfv10vepip0tsuqp/14053333371.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aea56a3c868---99901859582.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zaxokeda.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec24b13a43---23072955241.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/vomipakefojuzotoxasukusi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/ronuk.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/87856598768.pdfIn PDF document text
    • https://flyags.com/editorResources/file///bupevifurebefugujisa.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tuxozusobipakukuvevow.pdfIn PDF document text
    • https://seikai.jp/free_images/files/7327598197.pdfIn PDF document text
    • http://sireny.net/share/files/pibaribabuxoxudolid.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/62541127247.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e0a7160e379951ffe299476e3dc83329/28723309149.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/ridetafigasazabufuvaru.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf54202d7---64935390843.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/59242897311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=al+arabiyyah+bayna+yadayk+pdf+book+3PDF 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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 17888 bytes
SHA-256: c2b709d45cd4a46865c6e43f06a12a209a213bcc0c4e462df77a4cc8b2c50f62
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 10696 bytes
SHA-256: d06885e0b0dbd9b48e10e10a7d56361b006640c5b4a3f5f5bc7327540d817a40
font_02_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1