Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b72ffbd11a6d6b0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 09:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6485d01e05cc4412512a25904157833e SHA-1: e8bf23b1e7fedf91e7c5e476089ca16fdcb0d2af SHA-256: 3b72ffbd11a6d6b09b4234d287d7bebf4da4328429685b72839d09e9fe4deb88
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44086667633.pdf In PDF document text
    • https://aarhuskortet.dk/images/file/fevaresimok.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/tirexinuted.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/situmimegimisakimuju.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kisodudaxikufufavaves.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qt3f9r4b5mh5c0fbam72bicb3h/zixuwemojaxefu.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/65488142832.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f248695bff6793b21a40ca759c36f6f8/59838268332.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a88fe86d954---74352781069.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/fowagoginelegedekob.pdfIn PDF document text
    • http://seamacros.com/upload/file/85694704562.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/15209360979.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tigemetegilupugudiwuziro.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/kodotuwegimobekazojogor.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210818_92668FD623884319.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/33755407856.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/rakupafemuvogelobadevan.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c60069b29---vakimedelobedexesinugu.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/luvunobopadewovopusanu.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160771a58bcc94---boradepomamajiwewa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1610295ce9e82a---20580237.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c69aeca8d95---gerudarafebeti.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/18832c6f096e0bc21b54f6b3b80b8470/65477726670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cociente+albumina+globulina+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/zupapewaj.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 10968 bytes
SHA-256: 33cdd2af940ead1a9400972bb879027dfd5c4df6e07550cb78b292cd21e96c54
font_01_sfnt_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 18240 bytes
SHA-256: 9ab3f3e5c9986c118d8d44003d8adf149e757e9e8415c2c7e407b563baae783c
font_02_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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