Malicious PDF — malware analysis report

Static analysis result for SHA-256 557ff1accb0e175f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 07:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58764d0ed34771a51676c7062c421655 SHA-1: f54586b6472eadcf47614494cbefca6b86339122 SHA-256: 557ff1accb0e175fe8e5385a63883a197a671d59ae07f304ec385a6db516b4d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. No scripts were extracted, but the primary attack pattern involves directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://xn--80aikni6a0b.xn--p1ai/images/file/nomekabivusiba.pdf In PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/48504038476.pdfIn PDF document text
    • http://abnicum.com/files/file/59870504829.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/nexaxirolusalexuvisaro.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/14014386675.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b335ce788c40ef56fe4b2f6a0e08cb6a/63698454918.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/tejadubul.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/detevij.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/29218620143.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/27634636063.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/jejesilobezevolepisepo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203612718c---metusevewukijesuwez.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/3918094099.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/tokesopofijopane.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906043831.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/50335173706.pdfIn PDF document text
    • http://temple.mo/userfiles/file/86590430208.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/36653881867.pdfIn PDF document text
    • http://yjccnc.com/upload/files/28411806152.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/911bd464f67f2b420339395eab642048/tusutuxadupafafabirafej.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/31585172455.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a916307b4---36039998638.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/nujolupajuzibijaruzadej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+backup+to+sd+card+appPDF 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_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 10644 bytes
SHA-256: b1680fa7fb8a894a8c72732f58be95aa6e0a73a80cf8f364966f965a5b03db67
font_02_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 17536 bytes
SHA-256: b19848a1e5b006710788c1776bb34a9a2fce50d2213bda3cec84ac4687e55e7b

Open this report in the interactive analyzer, or submit your own file for analysis.