Malicious PDF — malware analysis report

Static analysis result for SHA-256 52af3ab57421a416…

MALICIOUS

PDF

78.0 KB Created: 2021-08-17 04:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7c08913a16f4b3cddab736480ef12d4 SHA-1: 111116e564608683e7bf74d04f0ff466ec8d7dfa SHA-256: 52af3ab57421a41681ed5cbb26eeecfc6575fd7e1c63acf7da05d1d44f651a79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://timnhanhonline.com/upload/files/donesozafuk.pdf
    • http://prosquash.by/data/93149346368.pdf
    • http://evevoyance.fr/adh/.-/file/rizatufamukekabebuwezimaf.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/66f8ef9047f9cba7ca5e922c0e4eff20/gasaluxojebimewamupamuxu.pdf
    • https://ap-qatar.com/userfiles/files/39243524021.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/68567558569.pdf
    • http://alarcon-v.com/editor_upload_image/file/tutekuzitepew.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609899aa640e0---72484439361.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/96906210294.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66a13c614---13937905814.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f544883b4d---vakosagagixizefavadab.pdf
    • https://guijek.com/userfiles/file/96838577237.pdf
    • http://meble-tk.pl/userfiles/file/58015423265.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6f79747d---83949109279.pdf
    • https://gites-les-bardots.com/userfiles/file/93717412685.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5adbb2105b---17444927667.pdf
    • http://faxik.online/ckfinder/userfiles/files/73716070528.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161003825883a9---91293592851.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160945f3fc4c98---kejob.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ce992643890---sokiwafito.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa57c952a4---67025884902.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/fajovegipi.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b52fb3233---guninexuwijozapijawibixom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=suros+semiologia+medica+y+tecnica+exploratoria+8+edicion+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c1.bin
43a1645575025f3d2976a213c64a93d7e6b8ddcefc5f1f72fce6ca59b35309a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 17980 bytes
font_01_sfnt_off0000f414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 16792 bytes
font_02_sfnt_off00010c2b.bin
a93ccd651c23b875fbdfece3282171e16ec5597dbe50c59b7adf37e127ed0c5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 11564 bytes