Malicious PDF — malware analysis report

Static analysis result for SHA-256 128db9dff0d5d476…

MALICIOUS

PDF

100.9 KB Created: 2021-07-07 05:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ed5875b307b966f82a7b3de41355f2b1 SHA-1: 121e2016536adf25f8fbf78129f85315fd7aadac SHA-256: 128db9dff0d5d4760131336d8d99b8cd0b9d857eeddd2788675b4f371993742e
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. It contains numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://irlanc.ru/uplcv?utm_term=inimical+in+a+sentence PDF link annotation
    • https://toskov-yordanov.com/userfiles/file/pipozenetewuk.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/dubudinezepavo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/240b9e677b13aa6bc24ccc6a7bd06f3f/74130112764.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/34036552060.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1250a321---4190372633.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a4a1d4f2---33261225745.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16074696089f60---kovulogovenus.pdfIn PDF document text
    • http://ledins.lv/cms/file/86749254907.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e9059f4fcdb47bb1400244a202d0ff36/16098309800.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/048b0mka98f8l0qo9mh59l402u/23118473096.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d0e27035a---gutune.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/27534304890.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/maniwejemitom.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/selirexerodaxawogaxesiw.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/texugaxog.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/44895411816.pdfIn PDF document text
    • https://tomas-music.com/contents//files/16977687936.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3e6ghucl1k05qv94jnfvt2ib1d/83370234340.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210618065923.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/34138606821.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/6983950409.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d6120a84---7698259797.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/94353705775.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/pinunerobufolinawimapipok.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e7a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7A0 18456 bytes
SHA-256: d4034d07c9fa2d46daf3e8ae7a82e6221b7d6043b30c9108b297365ff5b610c0
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 25160 bytes
SHA-256: e96ba1e056b4abf50e6b300e8bebcdddaaa118af57df44306ff408fc4213caa9
font_02_sfnt_off00014446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14446 10124 bytes
SHA-256: 7df355ce828d62991c0468d3e09f0da7ba26627d22a655739524f711f6bb822f
font_03_sfnt_off00015ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000172e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E4 4580 bytes
SHA-256: 413b48c5dffcb2548500272c53dc564f2eff4ca94d1a91f0ba9d0c9cc669624e

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