Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a6636c58798a92…

MALICIOUS

PDF

117.6 KB Created: 2021-09-01 19:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e00b41c4ce435f0557ad93a113b0f1ad SHA-1: 1d772785bdad38de81e95d97de4c8168dc4475ba SHA-256: 83a6636c58798a928e60fa7a80473af9e6d5d8126033e4f34de2d9fbc278fb49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/98cf73f584b32abac31a91d78d5d447f/tebulunonupogut.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/novumenexovaxajenetunix.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/hnn0h1u7nk6lnekuob4l4daars/zasesugesuzovobinawi.pdfIn PDF document text
    • https://ptogel2.com/contents//files/tomigojenujarudo.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/834200.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e21e8ced6ad---48554261213.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/luzopowam.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/900vb17l57h3pfn3lu103ejq52/voxezonedoleg.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/71530717694.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a592a133be3---3115246716.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/56133735241.pdfIn PDF document text
    • http://benetalent.com/upload/files/93325069544.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210810050531.pdfIn PDF document text
    • https://bloomeng.com/uploads/43622276114.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1617489760dbb39fe09e3.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/81120672680.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/doretikabikawasakisob.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b372e317f65---31877366927.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd5f6bcdbb---33519678683.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/kijetarudijaberalatet.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a132fdb9131---gakolebirejezar.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a815e6f01d1---87930241337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=uncle+daddy+clawsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/09648a30178fae2304e3ea21797f6ceb/61620182482.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_off000167ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EA 18944 bytes
SHA-256: 26195feed099a7133f8206af674300500f1ec7dab28eafaf5f10735f5f047b80
font_01_sfnt_off0001992b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1992B 10160 bytes
SHA-256: 77ee58240fa5412a80b02587d0cbb01fa063def6e8646a099a9ca466d6f8bf91
font_02_sfnt_off0001b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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