Malicious PDF — malware analysis report

Static analysis result for SHA-256 227c8943a902c163…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 14:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bd94cd10db2947eb36b30ff96c429dd SHA-1: 853e58dc32735f9cef041bcca49fc2c383affc38 SHA-256: 227c8943a902c1638aeeed230c054723f2584ca6077f432110ca782eb0fa4128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure victims to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bet-balance.com/userfiles/file/85755823888.pdf In PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/9902058361.pdfIn PDF document text
    • http://119pump.net/d/files/vekeriwo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/86ockv56fjrkpfkesdpfroggt3/87725605617.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/fofiribemibavigemubasefo.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/palutobixixafesedajonevo.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/tixerapil.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f7b3232a38b4d8c6add301875877edbf/77862908432.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/fulidugupodiwemaxop.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/zuzusab.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/jabubelanup.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/9024735446.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161331a6d4191d---maxerikomebovavufo.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/zofozemeke.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb184ddfa---21467076049.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134070f69f42---13154866826.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/88720054827.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/nabowemozegojanewigowegi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/narebozimelikugejugabotez.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/51783254251.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/56490793459.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/56282640072.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/koniwebavewuduxasadapikur.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/barurinegoduruvat.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gijabukevesavowevoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+save+a+text+message+on+my+android+phonePDF 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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 16744 bytes
SHA-256: c088424632fae924064870f95c14cef81ff331e2bede4d20e939156163715da3
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 11152 bytes
SHA-256: 5b95eb5a457849bd46a029dbb69e41e894962d2608b547262727cb9d91bd3371