Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e2ef6a707df288…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 15:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edca767053c45bca0ffacd8befa8c245 SHA-1: 10a0e123d4d05e7b4f7f5bf269510bba6e6e91cb SHA-256: d7e2ef6a707df2880d020542a2cc88ad346906fe074884de4d46b6a30bd455c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to compromised CMS upload storage, indicating a phishing or scam attempt. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document's intent is to trick the user into calling a phone number for fraudulent purposes. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hightopeducation.com/cms_uploaded/file/21551730533.pdf In PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/rakirubodometerev.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/jamekusolexexudu.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/foriradukusagabuwuwod.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/95527775073.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/kevesanok.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210903_FC4F233EA95AA709.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0e954269---52051533307.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/nawex.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/85353101246.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/vanulosobolemumifasuwu.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/14455991710.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/rididazifesegokomidij.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/mununofamezabijapes.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/fakavubesixafetagimeja.pdfIn PDF document text
    • http://aa-nusd.jp/17529511370.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ec3a6f74---kepegowulud.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/10974904562.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/591278821.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/23853292657.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e5cb56ae---kugomokajudesivunej.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/newofadizowikorukem.pdfIn PDF document text
    • https://stotex.rs/files/jenokob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=redmi+note+6+pro+vs+redmi+9aPDF 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_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10952 bytes
SHA-256: 1d88b8286c7da52d54d0ba48159025c3a34379f173562bda8c4320e2ff0b6871
font_02_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 19144 bytes
SHA-256: d6add1f30186ff034401e3948f4a53ac393b597748cdfff8549e60ffd5cd9454

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