Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8309eda8d6c5aa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-24 20:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f5118cd674c46032f3badda6da9a586 SHA-1: cc0cde4892b78cb7471edf4a382695056f22a900 SHA-256: ce8309eda8d6c5aadae9f84a147adf4b6048d3c515267a421b4d9afaac182853
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://profession-your-dr.com/uploads/files/202109081122403040.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/70d651c0d5ad5282c73de3b1c5bc0965/tifomejafujaledabikodeke.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/80153991510.pdfIn PDF document text
    • https://samowar.ch/upload/file/torexofomaxitubuzureke.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/raropujepelexivitor.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/61773965376.pdfIn PDF document text
    • https://alpinashop.bg/files/kizuvetomawelinarekewaxup.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161420ea3e1f9f---wapovevimasoxufadipugotif.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/46751498949.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161344d8f97e15---waduzatajor.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210918020229.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210901055507_x62gfs.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/94398557960.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c105e81596f3714db2736096fc13586f/42938388922.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/58687966808.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/raxosudaturotemasotek.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147d26297839---70397211549.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/887bfdb9d9f1f93b5cecc3bc05099029/wereludigazikakiwogarewa.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81903d396---xuzodu.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109140042534197.pdfIn PDF document text
    • http://theponghop.com/upload/files/pujirogefetelezupi.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/93132085938.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/moxodo.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/44946973336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+stop+advert+on+my+phonePDF 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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 10776 bytes
SHA-256: ab0eb1a07fd994dde0e6f163eb9aa19b28822c5cdfa8ee32673979ac669e2922
font_01_sfnt_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 18628 bytes
SHA-256: f03978b1b92779025120b5dcab88d50832bec24ade61e19e89c0bd87f2d675a9
font_02_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1