Malicious PDF — malware analysis report

Static analysis result for SHA-256 adca3e7400e41598…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 20:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: acafe7ac4fc5e017b3bf9ba97fc3f440 SHA-1: d264422468bbf872113a5d8ae26726de9b34f18f SHA-256: adca3e7400e41598eedae76b1486cb774d9f2cf36289ed70a4b811abbd671744
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, hosting numerous URLs on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, aiming to deceive users.

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 https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284164f582---45517061683.pdf In PDF document text
    • http://szhlfz.net/upload/28031985255.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/72657062619.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/51058488857.pdfIn PDF document text
    • https://ratosatu.com/contents/files/78670233970.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/69571106021.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/ragin.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lelariwoserolezoxaw.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210903020001.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/zekolizudujasixesebofome.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tagitipoje.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/41741557365.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/56375193632.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/42014055457.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/936dfece01fc2ffd9772a599ebc0ab06/51283338190.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/25896282214.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/zenulafubegez.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161378ac9d39a6---8350920535.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/momanerijasapofono.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/40213133253.pdfIn PDF document text
    • http://www.agot.pl/upload/file/rajugefelinovanu.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/jotibilatewexob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=printable+base+10PDF 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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 17440 bytes
SHA-256: b44dcea175b6507d5c2feb520ee14a44c68dd5fef5c75da397103f38b9bd5a5d
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 10296 bytes
SHA-256: 1f346c0ddaa3f0733ae3ae60f162e88022d31faeefa6aa2ef688ae7e9f8421c3