Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b763ca0b04e80a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 16:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4383c521980fa8be1b166f815af9d744 SHA-1: 32622084ccf4a762c2282c81111dd1d2b452a73c SHA-256: f8b763ca0b04e80a0d4f7ca24263c64267919f8872130c549fc6656988073a70
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The document body was unreadable, but the presence of numerous external links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084227454e27---8270622215.pdf In PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/xomepuzuniduroxub.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/basikajupi.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/rerujesaxofejidofevewok.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085a279a611c---75227880034.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/bibed.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5fb4d2aa---30809991767.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16073bed000c0c---36024112575.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e0f22b74---kamosovoxakoli.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/1358627559.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ccu868hp3drv0cv1llp1rfc74o/52911360588.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8510cae06e---lexixute.pdfIn PDF document text
    • https://carlojans.com/cms/file/kudexi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c1ab5e954f3b26b9d07acbfa3e091245/punaxunisanumupivi.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/rebinasuvikopu.pdfIn PDF document text
    • http://gysanya.com/upload/file/210803074932525598ibitnhra99lb.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/mibikubajuwi.pdfIn PDF document text
    • https://rcot.org/userfiles/file/58134040049.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/sb8pm7gf21mo2msipfnhht4uc1/daninogofimafovubejow.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/jurepafenidulivelit.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095e28f73535---97499121343.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/wabowikivixaraw.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/66292297655.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d90d38535616ad1a9ab9aa7c88ecc070/kozaweluzexanapokajinaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=epoch+2+microplate+spectrophotometer+pdfPDF 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_off0000be03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE03 10884 bytes
SHA-256: fbfe46f1cb92d5c4de93e07c7bdf8fa016478527e2992011c0cc99b654abb6d9
font_01_sfnt_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 17800 bytes
SHA-256: 63e92792c9bfcc5926e03b450b561bd9a6d8296e2060b82790848e88d24114c6