Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35255fe0184fb5b…

MALICIOUS

PDF

98.6 KB Created: 2021-07-02 04:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71c1f3d6db55656154ea645bd8a5374f SHA-1: b8eab3742f6a0bd4909766b86860dec342589f6a SHA-256: c35255fe0184fb5b48a37d7e8b0884724bcb24650acddebf7ab9caf2c36b204a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters in URLs indicates a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://hyosungulf.com/uploads/file/rupasosatadoxosupupe.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2o5pio6t1ilqo5ecvvrgftb2l4/bosaziniluforagepujo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5f184e411962c075f97d7e4764412a9a/4481102391.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/sapumugutada.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/37fd900462637e23f39fab53bf329280/bibawadiwuduwipigew.pdfIn PDF document text
    • https://noddy.nu/images/file/14560281269.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ff77c235c3866fb8cbdde87033f76384/25544751754.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c4f9e41fd688553c0fad028410348c4/63603597663.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/bozebegumis.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/pusamekanaxifurixisadifo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607730c43cf6d---49262877473.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16081948be7106---nogorigoxo.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/36209156440.pdfIn PDF document text
    • http://aweibel.com/Photo/file/27850286493.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/lolisofaxopukunubat.pdfIn PDF document text
    • https://hgb.se/filer/file/46678371969.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/giwifujiwajazonekasevu.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210623000409_229371893.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076843e40ea9---derudapuzadinevubow.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b37q48frs8mi2fd3kv7ktbmlh/86561667727.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ltrcdhldlqqnthrepucmnhktp2/91590979027.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/03tk625tensl65gk57lh76oe9v/93265743939.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/lumovajefunamenagabupefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=man+is+a+four+letter+wordPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 16392 bytes
SHA-256: fa2f14bd6cea0cb4872a2d91515c10dd6a812186eae6ce6f58a1712f7f32b4d3
font_01_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 21312 bytes
SHA-256: bbbe8a9f56212a42d691873d7cc1c05a6459856c0d0e45d3b8d4e9b6ee1db1bc
font_02_sfnt_off00014287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9E 10528 bytes
SHA-256: 66bd4b02e8c3da397ca3b340122c7641ddf5e6faffa378fc94e0de86ab2a8af7
font_04_sfnt_off000172c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C3 2132 bytes
SHA-256: 082c9b3953ac2190031fef02773bbedf3b960673f1c72205faf0de332286f4e0

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