Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca51ee5ae3b7b47e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 06:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee190f30125471e1b555586d4077b314 SHA-1: a9a95761ebe890f28dfddbabfc82b15875cbfeee SHA-256: ca51ee5ae3b7b47e5d8778253740ee5898718b1de4ff74c2eba24f63348e5e36
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM specifically highlight this malicious linking behavior. ClamAV detection and ML classification further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://hzxgdz.com/images/upload/File/73694979525.pdf In PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109191907581762.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fikitaz.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/94282668934.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210907140323.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/41085621084.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/faxowesefusutew.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/70342472501.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/78a5699e804a531a942db4b99f209709/nojukunakugazefakopuwiluk.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161331784e508d---fupotuwas.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/zifububupusurod.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/94116819215.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/gonakigaxorupa.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/42870977634.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e6b4756e9---kiduzonekewikas.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/38305466411.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/84996422919.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kalumezizeverax.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490f7be3c75---wesojixumikarumerititu.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/97760155298.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/93427929399.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/67057972201.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/kepobod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wild+rift+apk+hackPDF 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_off0000b0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EE 10280 bytes
SHA-256: d5e999c49e7702330d35ff326ab0db1d9bba6664c20778e74081f2de7ab24aee
font_01_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 16368 bytes
SHA-256: 8c3c01c7b847558636438c49e724ccf5c75e227ad32f8b0fcc4316ea8eb65c0b

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