Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d3bd8fb3217f14…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 16:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50051621c24f8a1104b90f0a33b3d780 SHA-1: ec4e52e93e6b5700ee710d74ad5e74720997a7d3 SHA-256: e5d3bd8fb3217f140f12a2506157840f789acee9f5ca0477362850060befffd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination or evade detection. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noddy.nu/images/file/65925918344.pdf In PDF document text
    • http://e5tbr2.alruaa.com/ckeditor-ckfinder-integration/uploads/files/37051828216.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/jisilenopanukisekepi.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/94735834628.pdfIn PDF document text
    • http://sgpeo.pl/users/file/14790878724.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/64300464979.pdfIn PDF document text
    • https://5uempat.com/contents/files/88906365939.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/fedalafotezu.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210911170734.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/jisekazesexebozo.pdfIn PDF document text
    • https://insp.biz/img/file/82653106652.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614af2ee5c93b---xawat.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fezujamox.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/44225060941.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/morabivozugisivixuxer.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343af70a91a---lorixetupevatipibas.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/93081419983.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161378f042c36a---gogoroxugulitaxerixu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///xujopuxigerejifudel.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/16979594585.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/jewegidajofir.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/fisibarukubowugumawiwot.pdfIn PDF document text
    • http://kvrhousing.com/uploads/85884520781.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bowefelewegawakakekokaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=arrow+on+top+right+of+iphonePDF 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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 17172 bytes
SHA-256: a355ec3909a532c246370acc87c5bdc9c8b52a2f29f3dc2507579eea716affb7
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10328 bytes
SHA-256: 047737fe12fd7f3c8e81459ba9ca6cfb6f8579fa5315078a0332fcec95a02572
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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