Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea37703493f41488…

MALICIOUS

PDF

86.0 KB Created: 2021-08-23 12:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: efbd78b1c9e0c040d50065b22d1eb74c SHA-1: fdf4287dab9f7ca37d2cd09944d0c13701c154e9 SHA-256: ea37703493f4148815fd82c89b9ffb51300baa33c48a1a325b3f1880b82a9b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are designed to exploit or deceive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ntiverification.com/userfiles/file/kejituvuwopefu.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c8797b0cec9---podakomejebukuni.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210823_171406.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/bixatixuwuvolizuli.pdfIn PDF document text
    • https://windsbs.biz/files/file/lesobami.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/saxenekegurale.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/77400458786.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071df49365af---83355223463.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/98267707783.pdfIn PDF document text
    • http://aps-mes.com/files/file/pigajedamasokitabe.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/v6pk2jd7r3864hq5l0d6lv6rnn/1805306817.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53b5c1eb7---5720358612.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c7fdf13a---19943310735.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/susegus.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/i2n2nfgf97mii2e5vaf7jf4gvs/14171233999.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6b833cac0---19203120555.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/648f9b9ac5b36b5d78108ade7cd459b0/ratekubikulifarupunoxuj.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/45420030977.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/69149522471.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607959dd032a0---36947862767.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/45625140709.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/45979424381.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8fdc1b143tob022dq0u9i6g3rk/wokinixeturadivasigeze.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/rekemovidiminazasutejolas.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/44767640551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=couch+to+70.3+training+planPDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10892 bytes
SHA-256: e8bd873fc823ff777723c98f6a78edd7d8a4b23008de2b2aea638c0e6e035de3
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 17412 bytes
SHA-256: 75074d9b99b0ec597722c60579a1de145b7e00e8b00a92a77ba9323353d8a021
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1