Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed57c68eda093ff2…

MALICIOUS

PDF

95.8 KB Created: 2021-09-16 09:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a801b6cb363860376e2215663f2030c SHA-1: 6e179677a4f96a04a40123c781a6aac4ff072a4e SHA-256: ed57c68eda093ff268af28189f3fc371bbd135be7bc3659d2c1596dbdd25d8b7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. Some of these links are designed to appear as legitimate file downloads, potentially luring users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://bbfrontedelmare.com/userfiles/files/topuwuzogaxogirokewuk.pdf In PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/24081339685.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/furevowekajozefupavudawa.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/19781592469.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/57199631639.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/31108600174.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bijofegutomaten.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/65160007303.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/60399588408.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/zixarekemusaj.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161413d188bd77---63435753190.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3c0dd02c---negapawofobubawuvi.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/85396930353.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/kawodususupa.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/soziginalejaxaxanomokebil.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf4be22c1---foloxepakisor.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/72005577280.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/80972023490.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/beripiveja.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614011c664804---majurazotaderexod.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/20990127349.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/17938096611.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/rigozaxosaveserego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+factory+reset+htc+desire+610PDF 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_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 18296 bytes
SHA-256: 9a3fd09064f4c0ee3b2a91ec31944a560e60b6374f8ab759c43b3a8a57254483
font_01_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 10956 bytes
SHA-256: 92f81db3f7beb2fb17d296eeeaedc0203c93e83da47bd02888c8b153b10ddbd8
font_02_sfnt_off00015922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1