Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11a4b6ac8dba72e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 14:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: de716e8025ca1de3942731fac0a7295f SHA-1: 38282c76d1357e1ad8fe8c565daa00ad33b7fda7 SHA-256: c11a4b6ac8dba72ed7f3da6ad8491b7d13bc4751967b32a95a981d199a6c169f
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed that the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3127

Heuristics 5

  • 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
  • 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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/243a09b179103e08d7333aa8d958c040/xaterifujuzoti.pdf In PDF document text
    • http://solarissoft.com/img/userfiles/files/vutofumufonolip.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/dukefadigizutuxuz.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/81086678258.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/10430372003.pdfIn PDF document text
    • https://highrise.pl/file/witetusosavezugo.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/fozominupizubuxulol.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/f3c1tpev98oekioi9cuvl91gh7/fibiwijebazipizufaserataz.pdfIn PDF document text
    • http://cutskytools.com/d/files/81129797039.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/82510851863.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/zazozazevunobegipefek.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/88414544915.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/ketipatitipuzagixikukotu.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/teputeniw.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/resowurefenagafolewapa.pdfIn PDF document text
    • http://pbpharm.com/upload/files/57970022860.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/kidefixolip.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/fatej.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/38364858185.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/74814265454.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/xalir.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/93537139982.pdfIn PDF document text
    • https://activepymes.com/pub/file/sipulexukazareb.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/18144337623.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5476c02f629bede4594e917eaea2def5/89899399298.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/vukepuzaposupizepajebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+reset+android+mobilePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 18328 bytes
SHA-256: c471880ff8b2690f021be1d3aff2cdc85ba53e11cfaa091c14ab0af450bde42d

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