Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14d1febc1782a71…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 09:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0ef584e5a1606909f9f4f8e187dc06d SHA-1: ad0877369c0436f29af566ae5b64e16bf6d98c5f SHA-256: d14d1febc1782a716c26447617703ae8a0cc75e2937a52c68f77f27b0cbca95d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or using URL parameters indicative of link farms. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=neha+kakkar+all+songs+download+mp4+pagalworld PDF link annotation
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143f7303eacd---6104309447.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/76049988060.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/60576179078.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1c4k8no03qioot3sf6a2gshl93/korozivukilogeg.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jovavasujabimevimuzepo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614162f1b878f---rijojonugubavudijupomix.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/62940278514.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/41437925336.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210913055531496844eh0g1u.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/80074876324.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/112056195870.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/zegepuzimav.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/besixijozagobavuwuju.pdfIn PDF document text
    • http://freeski.hu/freeski/file/pixigegitorutixazujud.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/suromuxinimizem.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/xugisukekodub.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/kijoto.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/dogem.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2713da6f37af38e236008aa932676af8/fozowagubuvigibarube.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/xavukaba.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/jekuparekekudutari.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/xadikem.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/mafoweben.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/faragurume.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/xowisotededebidizifokuzo.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_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 16512 bytes
SHA-256: fd0c159085dbd582d0209ae9d40f33b83b0187696af69f88a13342dcd1a95f00
font_01_sfnt_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10884 bytes
SHA-256: 49ddaabb748f648c0d88cab8bad1581e6df0cde942bbf926741b925166fccbe9