Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9c25c754cea6f1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 08:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 609babf649c7a16ba3a757cd0f1dd081 SHA-1: c505b09143074fdce39e6011731e6089011eb85a SHA-256: da9c25c754cea6f1d235905e7f36d25273b7fecfa850ddf60d6fbb5dc9ea302d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cmtl.in/uploads/userfiles/file/file/kazunifarixaja.pdf In PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/rebabibupafomikilugu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/jogexupuxev.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/feduj.pdfIn PDF document text
    • http://kalikraft.com/images/file/fidumoxivinivinizizogoni.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/76624807192.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/tidaragis.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/84698801085.pdfIn PDF document text
    • https://nicosiacaffe.it/file/28034258952.pdfIn PDF document text
    • https://tadimtursu.com/image/files/javunozudev.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839d1736f90---61893233540.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5b31228e0ad5c5c97f586d728ef0839b/moxogafotad.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/n8j2ekhkp1m0bt7tin4bffh7gk/libatujo.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/27846601547.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/2c344569a54994c67ad31e20b48b24dc/butezadodez.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/14690634467.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/vc9vs622s9dft9dcq1b19nf0d6/24798792649.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a69ee6bdde71647a8a79516c8a8d1a3d/25815845052.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b40334807996684f01b338b0a08aaf6/kupakewezunolero.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfdc1efb06---82777760515.pdfIn PDF document text
    • http://quetthe.com/upload/files/judofiloregig.pdfIn PDF document text
    • https://avflash.nl/upload/files/71528850597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lsat+preptest+pdf+freePDF 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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 18128 bytes
SHA-256: 9a305115bccef60407f9bf2bad17dd41722b057ad97c505332c4ee6be5acc7bb
font_02_sfnt_off00012bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD9 10084 bytes
SHA-256: 0c4adafa1872cd7099b5d582469d2517ac4306d15689a4174054625aa7ffe34b