Malicious PDF — malware analysis report

Static analysis result for SHA-256 2057d2fed35bdcf4…

MALICIOUS

PDF

95.8 KB Created: 2021-08-04 22:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0868adb0e6496b76237850bb67bbda4 SHA-1: 5b0833bd3636874f76765decb9781613d230736f SHA-256: 2057d2fed35bdcf4bc8282e8860165d9efa7ea7dd900befafa52d82effaaf236
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 CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://maxtarget.by/ckfinder/userfiles/files/xatejamabarugu.pdf In PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/92717455706.pdfIn PDF document text
    • http://sun-tes.ru/files/file/wekilur.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/zapamobekimajafododusute.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/604f758035eff82a5fde64e2904bb1d0/ligolixotogunij.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/nisolo.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/2um6vgs8dvd7jknrcdmtia9ou7/15446734260.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/fegosakezapowemameni.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/silizifeb.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607584cd4651f---kidevukivoretasamiveburuk.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/xubojozawijalosemewuj.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d657bbd5de8---nojafitexazebupowo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c036f598bb---42153097694.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1bq182548ebfffqu85gv8vipq5/zakatisabitixuti.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/49236653865.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/zinoputunuvugan.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/90391835491.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zomuribelovubodaburo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/godube.pdfIn PDF document text
    • http://efrex.cz/files/file/juketirefedufidinebada.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/23079669550.pdfIn PDF document text
    • http://indecomavo.pl/inc/15395614472.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/fixew.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/noxujakotogoxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=behringer+virtualizer+pro+dsp2024pPDF 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_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 11272 bytes
SHA-256: 912390ca92b0c1b016e4f6d1345d9ee0b4c2296bbf656dceb786030200aad6db
font_01_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 30184 bytes
SHA-256: 89e0c8bf4d4e1fded0ae8d039654261ab34ac79cf397f3887101d19d3897f4aa
font_02_sfnt_off00015851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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