Malicious PDF — malware analysis report

Static analysis result for SHA-256 171d8f6a616b60e9…

MALICIOUS

PDF

108.6 KB Created: 2021-06-25 23:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a113fdbf46eb31e7cec9b89bb66959 SHA-1: 6d7e3c7e20e4267a27a4ab749c76cc7f6878d526 SHA-256: 171d8f6a616b60e97acec0b2c6ba97d1face873ff9e34ae7fc89475ff73120d1
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, including one pointing to a raw IP address, suggesting an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/h84s4nct0on97hgujd1vok5o94/siwoji.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/284c4809c129f41289c2d2c8bd9f25b2/34810202181.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b594949962845e28da62922fb535d9d5/bagoretawusefigesase.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160867df1ecbb2---midosokuvatir.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ca655d056de2a7ecf2ac58c4d896d852/tebizajimuxusemejesufuk.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/56iepd97jut43s6l0djmc1ml10/bifudubukokar.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4662fc4ce3b7c0a4ca8d4aa14be7eb3a/33523062544.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b46e9c5---sozusuripodokonibujixuka.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t38uee62f65bu101t1je8stvn0/bumoderozosedejajetidokod.pdf
    • http://157.230.241.115/image/upload/File/67007172383.pdf
    • https://arichaindia.com/userfiles/file/1134824048.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160992c50e41b4---50382406045.pdf
    • http://stpatricksreunion.com/clients/84553/File/44668037432.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8e4bb94a804dc1249ea0cc514ed58a69/zadufavepupamet.pdf
    • http://hotspot-usa.com/js/upload/files/dawugizatunodilawixu.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/g4codqvpgd4vi0216nj5tare32/77320540275.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f071aa96699d50f07cb2e2d332ea4f9a/49485288891.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92a66b47ac---liwupeguvamumejoko.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4c756ced---59871849935.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9bbb43957de0cb3dbcc598859d154b33/24080545635.pdf
    • http://pcccphucvinh.com/upload/files/40151771197.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/bowazapamarox.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/76e1553b2fdfb09be2e4807c927d0667/rakojaroradakajasopo.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8495ae7548fd9edb92ec874032744296/saxilerubowevoxej.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/d92tntlg2a3hgcjscdfr3sgo2j/80071943754.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fabled+1+destiny+2
    • 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_off00014566.bin
3b82169be42676f85ad3833a0c45eda0251546f0b043f4f56f4d86dc2ca3d244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 18440 bytes
font_01_sfnt_off0001755a.bin
a78a5986c1725b0908492dd608afdc3d2f559cf8e604846cfc409e54a235b974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1755A 10424 bytes
font_02_sfnt_off00018d32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D32 16792 bytes

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