Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dec4004a9b6f1dc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 13:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2f9d96065bae651d7635988f0ed3f16 SHA-1: 6bec2a0b45fd90bb05a682b5839145604f5be5c0 SHA-256: 1dec4004a9b6f1dc30d6934e61440f2a89167fa6180bf8c98fdee652c2e72582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of numerous links pointing to various domains, some of which are hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed for obfuscation and potential credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://web5gstore.com/Files/files/nijugabefikazaresanokilo.pdf In PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210904_8E0A6A8B40122A84.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/gakamitopajevod.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/numifev.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/novixezagori.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7df50343b2439089b8ae8a5410d887d3/11899799194.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16112520f416c7---35217606028.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/36d70f3ce26c3a53cb41d5e037c9f7ba/woloroduxi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/acu5dtr22g3emq0bhqdqh4spa7/49168328190.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/33620789718.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9qvddc8t5p2ipn40j2djt8jqh1/41442754546.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15361009152.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/madalifuwaronamutoguvonew.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210528041543.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/cf10efcd28d22d6197a419d2d1a92c68/68741396326.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jojemasafivevib.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9495d9804---tatesajo.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/veruven.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/39590299253.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161242afe24f3f---raduri.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/lutotososexenofinemaze.pdfIn PDF document text
    • http://baoveantam.info/upload/files/nerenir.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/vegavaxapapizovujupopos.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/27558587908.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/19996948513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tenergy+lipo+charger+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 17200 bytes
SHA-256: 9f4cca9a0eee3bdc26f79085eacfa2dc712c3c60b2cfdc1ca87c2fb1e2378c84
font_01_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10732 bytes
SHA-256: 932a02d513a9ec374098193a9fbdaf8617730eb53eaf123fa1117255712bcd9f
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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