Malicious PDF — malware analysis report

Static analysis result for SHA-256 7542567ada3c9339…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 06:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2f90f81d47afd377a26a206350bad1ec SHA-1: f62eb4383dd8094f4d8e58cbdb33d1b7a8ffeafa SHA-256: 7542567ada3c933920e6dc612325ab7ee266b394ca9be4e6c6d1690f8c9bbc5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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, with many embedded URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, suggesting it is designed to hide its true purpose, which is likely to lure users to malicious sites via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4tvc3s2mt1m3dgemcg9829uqaq/dudubegu.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33fe13f27---vawakisatevi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aff698bb806---wunasanulorilobego.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210529222311101.pdfIn PDF document text
    • http://allycatering.com/userfiles/54350887732.pdfIn PDF document text
    • https://cargobull.cz/res/file/xewemokip.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f75be9cc---jitarawijivome.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/xejawusipiveluduruvaredog.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/tazolakobelive.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zunobisawegosij.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/7vpnskjjmmndemfj5okk0f4iek/fazizugurobesu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/370f65ca5608b41ddd209f71d2b9d385/momufonitas.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/916c73d2dff2ecc8f9e2793b14556dd5/murado.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/43642206033.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8ntk897utga5f52a4dd60ivgom/63283164426.pdfIn PDF document text
    • http://wami.cc/data/files/pomew.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/vegatagoluziw.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jetoruzebitotuwipepune.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/094aade4c4b91ef9db5854a616a6f128/87446940045.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/68121451848.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/4n7e2quqj570ubmv3asv2hu9n6/mobenafonijepizenaz.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/83776813698.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/25628406421.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/o9fkdrgf91nujeuuvj26pavnnt/268044914.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/03d6505fab5edb46fd1b433402d93ea4/tezewafejiginasonemoganor.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e02b1d02b143dae781273ca8dec5b1d9/25661368308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mothers+day+date+2021PDF link annotation
    • https://mediaget.com/userfiles/files/fivepuninapevezivesexenan.pdfIn PDF document text
    • 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 17128 bytes
SHA-256: 77ad19e17be5f58e488b77e04c27debe004b2719b5b8450045759764eabde623
font_01_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 10504 bytes
SHA-256: 5fcd938c38a57b5e38f04c65e2215c292e3c5cd58e864a26e5ba1a96d45dfd75
font_02_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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