Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f56794a931d8420…

MALICIOUS

PDF

106.2 KB Created: 2021-08-14 11:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 571d96669182f2610a7b662590f5553b SHA-1: e7e9095418ccb352b9fe764ebe7849458adb091d SHA-256: 5f56794a931d8420886fe5c34330cb1b99c666adfe7f0486bd2bb8377c74ec67
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3d322bbf670933f8437971742cac166b/giliwo.pdf In PDF document text
    • https://hoatuoi360.vn/uploads/files/vejuparugolut.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/73687783529.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/233687593463e9fa452f7b19c31a813b/94887297369.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb22bbb4378---22382642556.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7256d14efb---gubul.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/24990197652.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/16966069751.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/zebegavisuxoxogezazok.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610503daa2385---faresotizifesugis.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/guwalepezubozowolavedox.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2d979cd6b24be1feb14ac175f26d9a13/kobusupofibol.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/90090122475.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ee0925b8---nekujopumopiwutelafa.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/tigikubid.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/92059654549.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/fuzeninabafotura.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/witesatigidup.pdfIn PDF document text
    • http://ahchala.com/img/file/50864901724.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/dezujuzofepisoniju.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eac483fe4---mubadudiwodi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/84619590433.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c8b159a4---30070344749.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/461l8pvcvakpjduuk724ms15ko/87284287064.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb70d53b9e---gedejivodozinewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=devskiller+php+test+answersPDF 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_off00013a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7E 10476 bytes
SHA-256: 00e8dc38d2023f6453e47d4a42095f9ea703e3df6a09c438b75e0fc0ce246077
font_01_sfnt_off00015251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15251 19104 bytes
SHA-256: 25c0c8d669ff3f5e84eb879ddeb191a58ebcaf49510e3b2da26bd7415dbf3a3d
font_02_sfnt_off000182ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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