Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a27f75e707ea9b…

MALICIOUS

PDF

88.7 KB Created: 2021-08-14 02:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 258e884e6bc8c418640394cb76f24668 SHA-1: 7e896d893b207761d333785297f58a9d7a4586b1 SHA-256: a8a27f75e707ea9b213b7cf79493a77326f0e5ca998cf6769dae2243c28bbe76
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://allytemp.ru/uplcv?utm_term=what+personality+type+is+best+suited+for+psychology PDF link annotation
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507045328849075.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/pr89vimjiu6fmp1cbo78ta34r2/gimugutadona.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/5f440243a34965395a2d5b6bf1a10c86/fexukajazujefuf.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/xuwanogulafanunuwifex.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0mljtop40arh5vsr6vo796nbao/xoriwerijizexiluk.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n5fm4g45voffut184ecc2ckct4/70616823708.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/69369045210.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/sirowapiwu.pdfIn PDF document text
    • http://jcpingie.be/public/files/kemiwitoregesu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f6df27a3---fudidetoxubajujo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4547e146---kepikapaliwowi.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/xesitakixemabowe.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/hogk857fiaqbg2dka6d1de78n3/36551067368.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/983339ed48cded4aa42d470a1e811d66/levixonizibebazul.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/rageduzep.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983b882affd---44955724498.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/melotajezuke.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/085bf9f7f50c4f5b588dd2c3bde82b9d/vapurokiponigo.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/suwalisukemipulila.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6beb36a343---fabigubutebakunomefam.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/28289428950.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_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 11244 bytes
SHA-256: 5a4876ea24de73063a894fc6db0ea5502f8bd6846c706fe57e62b54a23259848
font_02_sfnt_off00012b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B06 16216 bytes
SHA-256: dcad740112b6c0fbbf8032f6097364852bc790ef749e730fb95807b08f2ad70a

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