Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abca7709c34349c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 19:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87d480d67afd96d92edeb4562a7e4a08 SHA-1: 068ca703f81d9370c8257d7bdb1d263a13f00375 SHA-256: 6abca7709c34349c77e7b0e6605241e47a496f9356ebd961a82a197a0bd6515e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple PDF files as links indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hophamthaibinh.com/upload/files/virukaxi.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161274a17b3367---sexobakurukidezaruzoxu.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/jigunetunugevanuj.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/82964589019.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/bunupotozejitalanuneb.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/91382671193.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ada4901a---43976279670.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4d370c25387092ce4ab5b9ebe05ee09f/tiguwosekefogowe.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/lumutev.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607957a660abd---29787443546.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d58f2e33e0---17259141813.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/29049f7d864e48923fbaa699a9a10225/77329178676.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64bb935fb---xojubadarorovatirapakuzaj.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/letuwusawegurosiju.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/83322485201.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1ed89b57---vadoseniv.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/pakikazetozixuxofep.pdfIn PDF document text
    • http://royalgroup.at/tmp/nufaza.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/muvitigafafun.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0b05bebded412e5cc9515ee223a2abaf/gizivuporawule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jethro+from+the+biblePDF 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_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 10176 bytes
SHA-256: 4177bd11d12a66367944223e860178dab337387b437f76a1bbae2df84d00b663
font_02_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 15664 bytes
SHA-256: 938ebda75d007b45890deeb06f685e31da1b89fb329dae7ec795399d7695e78f

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