Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab495c8e71ee9106…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 06:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f19c3399133975a790715610517ce25 SHA-1: d4666535babcee44341ff9ea9e813a7f411c577d SHA-256: ab495c8e71ee9106f698c93ce90efcc09ff8990aa49dc611260a76527f351663
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing or trojan variant. The document contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable domains, indicating an intent to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://terfigyelokamera.info/files/file/77391887246.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bf500c806c2e9557d24e1bada83dc80/96029038657.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/42957880794.pdfIn PDF document text
    • http://omegaplus.bg/uploads/pages/files/22812142012.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vegutuzexurijijifikituz.pdfIn PDF document text
    • http://kmsenior.org/file/files/56522744037.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021911637416002.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/7be98187a685d754bfdc1d6095906cb6/kivovapexexafujesox.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/novat.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/lubofisedajekipetedezuno.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/57094853272.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pjsbo0cotbed7k0536dln0n4a3/64634407082.pdfIn PDF document text
    • http://abwrva.com/uploads/files/nifosokemiwotuburolesuroj.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/xebozonetalurogozadadubot.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/vebusuvefibi.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rulevulivedabepexofunim.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/zibetabaxima.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/69895915998.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/towosatovosutile.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/walisufaminuko.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/72995952527.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/52004347553.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/neteraguxege.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d99b39f4---nupejepawakobir.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/bumopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sample+realtor+introduction+letterPDF 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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 10684 bytes
SHA-256: fc1eee3a770c008220662cfea914bb1ba01d975b34139498be93cfd89ad2e2e6
font_02_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 17836 bytes
SHA-256: fed4087ed46b17fbe1424f1b80f8b48bb164d481a0e291edd60c34aee74cf163

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