Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e144fe9716188ae…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 10:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61d11ad93636780c28a99d2ee0f41b3e SHA-1: 51e622e1b4fce129f4e77da720f7997ba025d643 SHA-256: 4e144fe9716188ae1884d9893f5064cee3c2ae89d61139f8f4155f685c88071b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of 'utm_term=download' in one URL and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462a29cc84b---jamozupedo.pdf
    • https://cargotavio.ru/files/file/sokoxowuxosa.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/63581016237.pdf
    • http://theloanwala.com/userfiles/file/7602422039.pdf
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/56812124957.pdf
    • https://hnhaa.com/userfiles/tnejp/files/47895459503.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/93140005739.pdf
    • https://pima-alarms.net/slicice/file/xudel.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b44130104---mimibezijaredi.pdf
    • http://workontext.ru/media/file/davorogowegewew.pdf
    • http://hoachathoanggia.com/userfiles/file/37834039257.pdf
    • http://hongdacable.com/d/files/6733167564.pdf
    • http://artstudiodesign.it/userfiles/files/66104027689.pdf
    • https://uzsienis.cvzona.lt/resources/img/files/15588278206.pdf
    • https://holcom-solar.com/webroot/img/files/zadusabadigenidenokatir.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910124856664853.pdf
    • http://onfireinteriors.com/userfiles/1823720982.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/lqnnpt2t1vddbm78tgac98p9nhifbqce/42300769393.pdf
    • https://oancora.com/ckfinder/files/sokasijevije.pdf
    • http://sake2metustin.com/uploads/files/78330857493.pdf
    • http://cerritos.songhakbbq.com/uploads/files/26216943676.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f30fd2309f6b7c3b1c7a30f3b73f4314/tefuxonirodud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+pubg+lite+versi+baru
    • 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_off0000d3ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 16792 bytes
font_01_sfnt_off0000ec01.bin
8712c79be4a0b668d484df7b4fd812cc7d0c5af7d64ed256739006751c3cd1d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 10960 bytes
font_02_sfnt_off00010526.bin
6f6005a8a88039c269913aec5ed31329248b23f4ea84880581e2409874ab35a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 18028 bytes