Malicious PDF — malware analysis report

Static analysis result for SHA-256 02564d10b9ba9cf5…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 19:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e255f557c9af6f670fa3330ae1d97d47 SHA-1: 2068c7d0b81f9ed4ef40acadeb9a8504e0d9f6a4 SHA-256: 02564d10b9ba9cf59ba10ebc277680724a88a544b7244055bc685cc6b6d74646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of malicious PDF activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allasclub.com/campannas/file/66712293157.pdf In PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/waxugofobasobibufivivim.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ac4bb00c---18040000655.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/wufujaxepufifapisigezisew.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/36360256748.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/40762405021.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072418172489.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/zaxinezuguzadusotanakiv.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb5950650e---nezuzati.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/059f6dc3aaa467e3800c735077d040aa/zireranefipun.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f61181ad7---83876843466.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/gukawimuvatorov.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/vojexanifinoxorugufi.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/gameb.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0becb6f4---natedovovuzofosevanam.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/patijekutonawozawap.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///vegezavumor.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/rasivaxilolaturowixawum.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da131cab535---50001493320.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/82528343541.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202106027568_899231940.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/dibiganexufogipomej.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/81109274211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+my+credit+score+higherPDF 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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 16296 bytes
SHA-256: 13ec45c75a3e1306cfd87600f88ebc1d6aa4c0b01f56d1261884eef4be59e620
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 10696 bytes
SHA-256: cb88eb6ee5e23663c8ab5210c2c6dc387f99902795f02932cfc70c3461911a90