Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf23cbe0bdd97a4e…

MALICIOUS

PDF

107.4 KB Created: 2021-07-23 08:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 574979697a89cfdfb0f01ecd6d7f7f09 SHA-1: 0bd3963dbfbf5dfc128ec7d4f422090b7eb47593 SHA-256: cf23cbe0bdd97a4eb830ba5e14a642145a5a19f89895c73d921c3f17698e57ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d06e6112aa1a60743f25b4203be6ff5b/25266611777.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b70704a7---zawelurupi.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zesefavelefo.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/sowosilovuramoto.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087571e89bff---92751971920.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089f549c5d2a---94017770875.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070407235573499.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/02da992d183897189c22d38f63f1bfbb/sofotewigaj.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c71c80afe59a8d4cf6657978c64ffe76/nanukasulumesolazodupivi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba13c7f35---gowasabujok.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/17357418053.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10db8921f5---tijiketadiwebepu.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/86864993208.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/8608128512.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/67377615111.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86674831887.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/en8h1un2vcfu2eeveaj285dn0s/kimunesabitofuluretemo.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/migurizapikizabuniz.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5ad62f46fd578a339d9b38a2c60e809e/tovulanajak.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d4e1cd9b6---90972184979.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/dodarudolor.pdfIn PDF document text
    • https://naoshima-habitant.com/mogaxalaguxol.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7720c7bd7---33584704555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hebrew+meaning+of+nazarethPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ffb2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFB2 19344 bytes
SHA-256: 04ccb2310e9818a1fb668d60732ec4355288babf3b8629573677f86849748c76
font_01_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 24952 bytes
SHA-256: 56a5158c7d238de5a6234947a8d6674128ffbc1fa2b9912a50c76d3b74a46a0f
font_02_sfnt_off00015e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7B 10724 bytes
SHA-256: fad71da3039d36321db87a238544979ec0917023905c0ed6a84f1f1ffe839bc6
font_03_sfnt_off000176f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F0 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off0001846f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1846F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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