Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b7da820795cf90…

MALICIOUS

PDF

87.0 KB Created: 2021-07-27 12:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4dc6090b108fa989efd884b7d6a698bf SHA-1: 251251051fe6bb37555539a02256ea0486a178e1 SHA-256: 49b7da820795cf903088674287975d7170ffad3cd5fbbcb18fa55c6e2cba0b7f
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content hosted on these sites. The presence of multiple links on disposable hosting and the use of UTM parameters further support the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949cb6b5ef8---59013267602.pdf In PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/60558c797062c92088404c5119dffb45/56619765341.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/raxoxub.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51e37bcbc---gupeluwalogefixit.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2837ae6fd---zojoxe.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/pi6lr7hov3hp12tt97oaotqa2q/bewifiw.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/5251652936.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/xusagon.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gebifozazolazobixiliro.pdfIn PDF document text
    • https://strechybenesov.cz/content/7530520871.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67b4b5a34---bubasizunufonuzezud.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/7441658451.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/55701850965.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4dc753510797f33cb65d6460b81edd63/bidowi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tufipu8jvi2eudhpdkbum6ljcs/nenob.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7dd25cb8f---3606120351.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a807d03bd---83654190530.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2f0186a2---debibiserebon.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/73715602854.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd531af74---kidudijuwakabi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/75913e5d9fac9ae1d242de5042fe0246/55468115586.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a10bab95---89517153463.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jazonixexozuwusopepunur.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210611181428_3crpd5.pdfIn PDF document text
    • http://artepcb.com/upload/files/58738991132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=monomers+and+polymers+worksheet+option+1+answer+keyPDF 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_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10996 bytes
SHA-256: 09e2d7ce925bedcf58f88e3024443dcb86b77e5c7a8f2117722402a0fc679ae3
font_01_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 16544 bytes
SHA-256: 98b35eace19bafbdf1490e927620bc7ad2bc14b21c362b15dd787685550f4298
font_02_sfnt_off000135c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1