Malicious PDF — malware analysis report

Static analysis result for SHA-256 a705da320354e9b0…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 06:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08ce70604ef27c437c2c5dca03cf6d70 SHA-1: 08ef69f417a2a78fa57843d1ee97f262682146ff SHA-256: a705da320354e9b06cf0b838e17c932aafbb1d7c28d8cf452b39ac10a1c0d6e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://acgroupenterprise.com/userfiles/file/daberijubolegusela.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/e1kudjvovkv3uuvbintlq276ac/30635635361.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b807de26640---robamusosekelunanoruzulag.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/29188660266.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ac1acbe2---jagivudipogoruvabile.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/87337339985.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/eb7ec40dc1839d5a25854d094b75bb35/nebelefitesafajo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f0ad208f9d04ee6e610693fedf6e7266/94829125047.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/75206337369.pdfIn PDF document text
    • http://chinalabware.net/d/files/nixafitamugepuwidaso.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e215e98f9---mefatidiletejovozufegexi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c908294affa---wotabirenus.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/4053459952.pdfIn PDF document text
    • http://ahknchem.com/upload/files/papupatevalizepi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hqoiqor6dh2m29ep7jchc8ue65/44647483641.pdfIn PDF document text
    • http://ledins.lv/cms/file/bebudeludikukalevigovav.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ff4653af1b7c3ff3ce100405bc5842d/28736219581.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/lugogofufomoxiduzeju.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47636bc271---vepetepanigogerorogedop.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1bd22a2a7---1356716890.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b19663eb3a4---5423032098.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/gagirexozetebuvuxipakuwuw.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d8867106754b5a1b8364058bf0ec1226/99446215488.pdfIn PDF document text
    • https://asi-filter.pl/files/file/talalezofizarenidej.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/d6vbv6ngd1op5rl75d73ojv2ud/xaguwuwuwixafavek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=karyotype+practice+worksheet+answer+keyPDF 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_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 18744 bytes
SHA-256: 02bc128d41ac5d9d840525faaeec37cbc86a66724ee7dda1b64bc123ea305698
font_01_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 10708 bytes
SHA-256: 6c8bb131a98d1b048385bb110f1beac0a2aaba4cbec4cf88bcbe3c4998bd2509