Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0ef4f85cb9b5c1…

MALICIOUS

PDF

111.2 KB Created: 2021-06-29 00:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d5d8cec14f371f1f510cd2cc3ed579af SHA-1: eddef65699a51baa3e92a335c253a92cdc9bf090 SHA-256: ae0ef4f85cb9b5c1a2dc878f069245fdff8d06590b2555aedd51353797cd674a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, a technique often used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8e84c883---toworesugogotegu.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb22fbfaf2---56008855404.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84916449442.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736f392e678---46632679587.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/654fecac390b972f9c71d7f77058f295/delunotewo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81e001e20---87305444392.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/18665009113.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/58481408e4f0612c208b2997fe4b4c34/wozuleroxozasexosigug.pdfIn PDF document text
    • https://soechi.com/userfiles/file/nomutotamexuvilimikiga.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160736eaf37d0b---31647251400.pdfIn PDF document text
    • http://amdind.com/userfiles/file/31795585684.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae026f6e3---bimivisuved.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/melemodapugav.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917ca067a52---pepigedozivamaxusakofap.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/i4j3gtdge81ghfo2knanbb46tm/goketilowojebuwesugi.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/dowivuligejuj.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/fedulokimu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d55848f953540ae757852ce5ec3e977c/22426880816.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927e78a9741---vabuvawisibirokozagedibuv.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827f4ac6e98---rukexudigefimuduv.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/31595914564.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/47207087440.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/22202386477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=good+morning+sex+messages+for+himPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000152a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A8 10800 bytes
SHA-256: 6b7687d43d328ca97172d035473e7cb95ec2e7cc32bea099371a5edce6012b03
font_02_sfnt_off00016b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1F 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00018126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18126 17480 bytes
SHA-256: 69e86bb11ec07922454dd531757d685873303389a540a51837e2b34211ee81f1

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