Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f19c0abfa1f6f67…

MALICIOUS

PDF

94.1 KB Created: 2021-06-30 05:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88785a8f7813aa971f9a79b2f5c15ddc SHA-1: 4dcd98978be628ab2d7d5e27e474db3abb324f2a SHA-256: 4f19c0abfa1f6f6749fd8a25b23ab9792f417a9c5253dfae1ec77e52b273ebd6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The document body is unreadable, but the heuristics and URLs point to a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607915b87104f---1806491422.pdf
    • http://cz-synergy.cz/data/file/36935810937.pdf
    • http://a-kamen.com/userfiles/file/45729539742.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d954c5c27c9534461673222401ad1a1b/18976586770.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6c958f2cc9b051153f7cf8e2d559cec5/zabulifamogadux.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5095284fe243dc5437772ca81b6bfb6/zuditufufixalul.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa6c0a26b---polosowazivudisipitus.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/aea7b4a00373ae07e03a78d12a7b8d59/lasuk.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a14520a23---xaxokevam.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/en9qbk3fdpjivnovt0t2ejq4oo/giteg.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b071213dc1---49939152910.pdf
    • http://goldartline.ua/userfiles/file/46709117495.pdf
    • https://liniagdanskzydowo.pl/files/85852585061.pdf
    • http://kojeneckezbozi.eu/userfiles/file/zomigujulolibixijobedow.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ed68eb9daaa06bd382645af81eca3c85/87887602850.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ffl2a7krks2oeakofqfehbf4r6/lajaruwixebavezedotexo.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48062b6f0---dupowibukesutarubanoda.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607913c988314---60837386962.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076206aa1c20---52771430802.pdf
    • http://stark-tools.ru/images/uploaded/rifetononimenizexus.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44319e9ea12a3ea66417688862e2de4c/86726451281.pdf
    • http://askort.pl/Upload/file/4362582716.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00e50ff30---57272124632.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6e559a32d607d1df16ac4f8c759e7dcb/siroxagogujovu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=social+network+analysis+in+big+data
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca2.bin
38fe7704d39db7f7956ee4a8ae56c45e49548b63952b29284247a42336a07721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 11052 bytes
font_01_sfnt_off00012655.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 16792 bytes
font_02_sfnt_off00013e67.bin
cdf1857e4fb0af950c0a6c87f8db80ffe03e18185cba05e7f0311ff6a6b3ec01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 17120 bytes

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