Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e996442f983527…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 10:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd0a8df2dd0bdc8daced8722e083af5c SHA-1: 1c1c6530da4f66be769bf24ac4b689ba4ec92b0a SHA-256: e3e996442f983527123f15404df80e8159346e4ee9288e76ede797ac9b19b365
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution lure. The PDF document body was unreadable, but the presence of numerous external URIs and link farm indicators strongly suggests the file's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0b6308c50ba0e8d1b32404ee92abfa01/fowexesorepuzutukit.pdf In PDF document text
    • http://leton.pl/userfiles/file/55210028457.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c22629d80108f2f40231de548e87da20/26866292861.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba180be4cea---3289491949.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/36652191806.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/21416606361.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/2417455665.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/walawobilasozabeziwenape.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-6/20210506030815767764.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/penoxu.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/fidukejaneni.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/niwokowuz.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/30042105238.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4c22b0e9---6228439213.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/ramunebebinixetex.pdfIn PDF document text
    • https://kultmotor.hu/images/files/24575572151.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/tagivizelikararijaliruli.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/47245572412.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/48746075431.pdfIn PDF document text
    • https://activepymes.com/pub/file/vumozajud.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160944b449c2db---kewagofedirowezam.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3dc23a39f---dabisudokevuvul.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c93cd728b---42876512584.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wujenamolufuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=exercicios+quadrilateros+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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 10840 bytes
SHA-256: e6fb5522d6be76ec48d0d9bc59deb805081c181837d59b2e467b01140dcf3a52
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 20096 bytes
SHA-256: 6cfbcbd03b6da224ea667057c89e8b59d161b6f59ed68439c2fc8cd6607a03b1
font_02_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1