Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4840c5905b9e29…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 02:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 250210ec0f93d7726bfa24a281999b2c SHA-1: 68c163937fdf740022d3265c5566fd17f90e8441 SHA-256: 0a4840c5905b9e29417a38590e6f5b319951dba5cd7add5c35b325eea1ae08dc
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vietnam-intraco.com/webroot/img/files/jivekuzew.pdf In PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/20316045286.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/fuzikikedimifubi.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/roxovuniruvunolodome.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/jefomuzejelilu.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/51925391313.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/13026212439.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0806de76---3739601540.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/maberibezemorupeviwuzex.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/27198bc626d5274efb59299c5a69d17d/77869111287.pdfIn PDF document text
    • http://fnathservices.com/upload/file/37709393159.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/jizijaluzatawoguminoba.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/mununofamezabijapes.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/bebopukuxidiw.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/tekukaruporisos.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/32831630896.pdfIn PDF document text
    • http://firegallery.ru/img/upload/31707363571.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/gekiginepabexunalan.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/77981811890.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/kowekufamakufesusab.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6aca83be508c93d844325aea3146343a/kixujabowel.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/24168394560.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/remixujowozifadojufan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+heart+goes+last+pdfPDF 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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10544 bytes
SHA-256: 3f906d062b8e0a5f9183d5413ead623c558a97730c437b98c3c74a3a784ad042
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 17044 bytes
SHA-256: 798bb187c330bca1a2d3ad0dce7efc6ea0056ce0353efa061953f90b6ccf72f9