Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d898f27caa4613…

MALICIOUS

PDF

92.7 KB Created: 2021-08-20 16:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 713f7e0bc1da6f41ef4db3348462dddc SHA-1: 5fa401f5e84be14e448b1ed7fd58bd5928050bb5 SHA-256: 80d898f27caa4613a925d4d9aa5d7ad8e5cde5856982839de30fef63bb3291f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters suggesting a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted software, as suggested by the 'download spotify premium' term in one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.giuseppe.ru/ckfinder/userfiles/files/gotaw.pdf In PDF document text
    • http://hakkabrothers.com/userfiles/file///sajiwowuxaxev.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/fitutogaruvu.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/tenuzamaxe.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/bugilebu.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/zixomenanosuges.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/25414901889.pdfIn PDF document text
    • http://chemicalengineers.ie/images/74179644529.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/lezaluwabopuxofabawugog.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8a7e3c7b097a738998604f6a4537ae88/tevuwijuka.pdfIn PDF document text
    • https://sadex.pl/fck/file/97631033068.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/mutuxodexowemesupeze.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/fixikijuzemebamutevevo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6c7cade760a007c61441e2959d66fcbb/vusigunuriwetowipifexubi.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/83431952484.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d5ad5a53ed2dd731c0896da598bb7a6a/vodifejagizopet.pdfIn PDF document text
    • https://maria-galland.ru/files/file/30480609749.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tk36a4cflpibl6m26jbsv9071t/21002256543.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/wovabusutegonuxov.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607609abf1106---25912871068.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/ranenit.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/83875860259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+spotify+premium+terbaru+gratisPDF 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_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 11280 bytes
SHA-256: aafb4012d74ce76d9e571f896862839954e36c5b204b6788e15f70ea99995f2e
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 19256 bytes
SHA-256: f02dc9f6ade8dfa6d83d3ec888236788e40c5e4a78f1196c9b43547f837d1a16