Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62b951ca22bf09b…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 20:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8883e75e56c45e86d1c4d44b16f31018 SHA-1: b6686c6179ab11a789a6658a66a69461c60ac80e SHA-256: b62b951ca22bf09b187c3eac432894d8b5caaf4eb3b33c894163458d2ab64706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised WordPress sites, suggesting it's used to distribute further malicious content or for phishing. The presence of numerous external URIs and the use of compromised CMS uploads are strong indicators of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd3679b24---99552606138.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b76aaf8659b---luvofiwelojafoni.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/fugokapagok.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/7d7b369c8e09fbd8ed0ea56126adacd8/depotofijogepizozovonozar.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e6a5ed29a7799caf6c7c824c2ec8621e/21159951493.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c1bf7bd69---pesupemepaxurovaxotinija.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb53dbb364---legovewejutek.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/25ff28ef5d647a54c671d55b2091bf8a/wevozopukabamameji.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zinex.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b319f90cee1---70399607259.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54615e71c13f5026a0c9d4232cdd3028/66793341422.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6h064e19d50tc94e18r8r73ll5/rivurukuxijobetaj.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/efde2f1dbd2899fe671061a396d6f844/guzosarabuxapuzed.pdfIn PDF document text
    • http://quatang3t.com/upload/files/zebutavaraloxenujaw.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/vuxametubofanididor.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210524043306_t2lysk.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160780deb99b98---26440951922.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/5151233949fa0c4e952af307d03f11c4/70174028371.pdfIn PDF document text
    • https://longhoang.vn/upload/files/jatuxomobub.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d485453cc---94911088613.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb5eea564---rakadonulasuvimew.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebupajukaleludesa.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/buvonufipakukumap.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/cfd4c388f6a5ccebcb4b787cc25cdd8e/23781469354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=you+pull+it+youngstownPDF 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_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 10316 bytes
SHA-256: 40abad187a6de68a41bbb37ceaf457cda46f3a1efa7c19d9e98edabc683a3780
font_01_sfnt_off000130bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BD 16972 bytes
SHA-256: cb3f7cc623d238e56e8f15adffe31952f02a7e7e586eba1f4a3530ff3d13f184
font_02_sfnt_off00015d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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