Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c70779e50c5040…

MALICIOUS

PDF

87.6 KB Created: 2021-07-13 11:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: da2b84ce465b97d771fccab689f92e1e SHA-1: b364d395c2b87b2e2e7d84f2eaa54e93e45c259e SHA-256: 90c70779e50c5040419581009e97ff516971a1f6f9a33acaccf7c05a7c21ac91
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and the presence of external links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc6817723---49310456624.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/697dd16a2eb528c65789d57af166571c/54096288871.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/53893981494.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725bdb0900b---7184517060.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e15da4384---zikav.pdfIn PDF document text
    • https://basisnomor.com/contents//files/34446027683.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/30403294973.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/guxorafoxutamamuxonixerem.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e53c5c49---95564677130.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/ludawilimirukofesekad.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/16083167482.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/riveruvebilutojesewemo.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/97397965058.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25804f408c---xonadunuvabamulasi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfcfb87451---satuliw.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/1501368868.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/remojeju.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/51281218434.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a16bd78a57a---9372417724.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/dalevixupavuwosokitameli.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/71039586052.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/69104921399.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d5de4dc81---tejuxibenijowovute.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8c6e2126de1b1eef53870e8043a206ff/88118617469.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/rijumuzasenaxadopalinuxe.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96d73f7f9---71594590414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dead+or+alive+xtreme+3+steamPDF 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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 17448 bytes
SHA-256: de69f48732d30470b6f1829c9eca57d8e2e925d98c1e8384e2dc7eaed7764a8e
font_01_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 10648 bytes
SHA-256: c2ef9e8c626eb8ba1a71f4cf5f96f211503935a8d56928060855d94b4307e235
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1