Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3b65b3be22a80f…

MALICIOUS

PDF

97.1 KB Created: 2021-06-26 02:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64ff54fdf84b3ceb573ad4f26fc0792c SHA-1: 4e073b567d6806f858bd3d54b654e4aad6c5d9f2 SHA-256: 1e3b65b3be22a80f1f4746e232d8ce362e686c1239f597c692b29f0c8169dcc7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9c0b3e14---70613171692.pdf
    • https://edubox.mn/uploads/users/0/files/81420728434.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f2a407aa44d620d8e63a18017210e89b/44695235931.pdf
    • https://szabobuszrendeles.hu/files/files/duzezuvimawafuxefad.pdf
    • http://liebherr-tr.com/userfiles/file/gunaxipamaj.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb70b52d1---lodumir.pdf
    • https://tenfci.org/userfiles/file/43355494621.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b17c4ccb21fdf130ba362ad2437fcd3/zozuzabufugepateki.pdf
    • http://drapa-technika.cz/UserFiles/File/ludewitefirulox.pdf
    • http://chayka-svg.ru/files/27465868507.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/2852a407792c42f092f60f1b47572d9a/7908062843.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6e77a466bd3ecff5583624492b376e81/21361011088.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hr4b8434icfdg4n0gp22ugf4ti/13001494516.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/nb1q8qsebibqod0uqntnsvkid8/vujadupunag.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9f00ed3d---54978024009.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/sufapejulasixilomuvox.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/jedojipe.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eafe91c25c8c30eb404dc710af0627ca/kudegitaxigofujaribeb.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8853c999---fizezapejo.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c361650cdd3---69470325419.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/9586526732.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609001647b568---fujipovumolejanobevebidas.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/9a246afa24c9c2654c75c2e95532aeb4/garebatixekif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+moving+finger+quote
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013b7e.bin
61aaff430d20193cb38c9af1ed913d0374e0fa2b22be84fa23868bca658797ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B7E 20940 bytes
font_00_sfnt_off0000f3f2.bin
fddee3e7c711b99f64982ce2a9b1a83b98bae1581738896682caa1d59142c614		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 18128 bytes
font_01_sfnt_off0001236d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 16792 bytes
font_03_sfnt_off00015f64.bin
7d2e3913cb6aba762946edf7f8e6036a4a5350a1e36e1ea40ca59be3a112b926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F64 10560 bytes

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