Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c51747ba0d2b5a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 22:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b035ed160dfb072bde4c4dd8d8ad9b7 SHA-1: b31fa15a9b7faff7342b11195266c1f15bbc19e0 SHA-256: 53c51747ba0d2b5a2d24e2653388326e14401005520c3dddc9c341ff8c47bf9b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable or compromised domains. The embedded URLs, such as http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138012e8afc2---rewaxutixerepuxamil.pdf, are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pagyesa.org/userfiles/file/20210909075720.pdf In PDF document text
    • http://dfanchem.com/upload/files/96644617053.pdfIn PDF document text
    • http://erex.hu/upload/file/noluru.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a2d29b66---3430937285.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138012e8afc2---rewaxutixerepuxamil.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/lebamodativesifusi.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/30993503349.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bedenavilagupufinebopin.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/82142699795.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397adced48b---19865400466.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fexobuguz.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/61174052643.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/zezovi.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xupomizuvagu.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/65042199220.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/dozanalaw.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909171537668.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff48c9b5cd---tukagutegofofugakorirumef.pdfIn PDF document text
    • http://wwsm-us.com/files/file/rofati.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/kikipupavaz.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/godowidezuk.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/7210998885.pdfIn PDF document text
    • https://congchung7.com/upload/file/subisogerigowipubojijogu.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109082158562988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nerve+pain+in+forearmPDF 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_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 17632 bytes
SHA-256: dd3f84cff0fea1c84dafc69a21def194c9a8bbd66cecc3839b209fcfc7864f29
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 10248 bytes
SHA-256: 7a411ea4d8d68bbce1bd872de86b0c0bed4ede885f5dd9ce136c3c5ec8c0dc9f

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