Malicious PDF — malware analysis report

Static analysis result for SHA-256 168721cf89dff166…

MALICIOUS

PDF

107.6 KB Created: 2021-08-20 00:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21ed2a396eb6a9f62fc1ab003641f60d SHA-1: 5b92e7c1db8ac88e1549bfeaabf4d6114216cc8e SHA-256: 168721cf89dff166f88d53d0df6345eee2248d9e3676a7911c9a3cd6825b536a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://campingwithconvenience.com/files/files/xepidaluredudib.pdf In PDF document text
    • http://bawaconstructions.com/editorData/file/45442124605.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cff0819c524---24306902902.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e749d2133---68963011026.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/6ad14de88821bbcdf3066068a32e468f/jorivavukuri.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b355c543335---31729100391.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/41521436072.pdfIn PDF document text
    • https://mfdesign.hu/files/file/5275094858.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/99a2angqrm6i3etq7mqv7i40pd/fowatub.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/noxuzomuludum.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/pudutisivojoxog.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/45sshonrtmgrlq65k4hbcvq1b2/wimex.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c284b8aba0cc2e1e69f2a0534116d13/17737247393.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86181bb21---21807766538.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098da2d8613f---98281721192.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/vawirudekasasad.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/kesafu.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/23823379063.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/kitotekibukizotowoze.pdfIn PDF document text
    • http://zae.me/datafiles/file/51967644887.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/34066040203.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v175fjkb06avk77arbis0d7no8/wotegexepikejusipok.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/46f977158dbed1aafcbf9d69f49b9795/rujakupinebenozasetuvi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4ff46687622a75105a8a18e26ff0277b/dapafa.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba62941224---68870711011.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/xazuwo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/judubenaxazoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=resumen+del+libro+los+ojos+de+mi+princesa+pdfPDF 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_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 19052 bytes
SHA-256: 896d9e023ea17824d80b467f06fcd46255eead1250f80171f34d9eeb50e5482d
font_01_sfnt_off00016e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18636 11096 bytes
SHA-256: c4ce0d0e021423d50db6c5031e191c0772233102939b500d9d1d234e3f4f1b77

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