Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac0896194854a1a…

MALICIOUS

PDF

94.7 KB Created: 2021-06-26 19:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe13dfced73e5c10ff9449ebbf43b933 SHA-1: 29f1ef322c291d22d1025d71e3baefdab8d55478 SHA-256: aac0896194854a1a67575cb28bf20556a5877bdf3b18a4bba8e12abea9fa8eb3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ppuhperspektywa.pl/files/edytor/file/32939848604.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/danikifum.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7cb2478d2d7bce5e4ae974a3ae4baed7/zejol.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe8e03275e---jogasakidiwumiximeni.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4q9r7pdnp14h8ui5vdt3nej6g6/71157029793.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a41be22075f---bukepisotobijeboxenowiku.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/pcrgjg5pn61ml9jvutlf3uts3a/xolemuwupegenipuluderuxep.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608976ff7520c---56966406263.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2789001793d2052b8a37f43b16bf060d/11284463685.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ea2ac2dd---mumifoxevitarunemokakapi.pdf
    • https://motelandratecuci.ro/userfiles/file/40738346494.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcc1ae2f6---pifor.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/20928805454.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a54aaa18fb9---45975804964.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b09927333a2---gezefozew.pdf
    • http://fogathajtohirek.hu/fckfiles/file/tovofibuxojasugis.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c511bc8cdf7---35523467698.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97cce0a152---7227850121.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081da40a53d2---jazisigugekerimanoxeroli.pdf
    • http://robertoantoniz.com/resources/original/file/65248703767.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/794103b2869e7c17429ee1acb3c7cbdd/30327312483.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/actc6lmr503aud0s8lsi2ct080/733057525.pdf
    • http://zjqzzx.com/uploadfile/file/2021052507292173499.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f292c2a8e20c07cd4495e3185cb0c9d/datusosamowabumijo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=illegally+obtained+evidence
    • 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_off0001109e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 16792 bytes
font_01_sfnt_off000128b0.bin
d4acaa76af5ad8f448dd4c9154e79d3cd50a04ae668ec332783113014862629a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 17196 bytes
font_02_sfnt_off000155d4.bin
25130956b279e325ee520a40c158da4cbcec0b0399e36a422e92d0e01951a443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155D4 10548 bytes

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