Malicious PDF — malware analysis report

Static analysis result for SHA-256 d275d6e83c4fb0d5…

MALICIOUS

PDF

78.9 KB Created: 2021-07-07 11:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2eadd7b519df4f3cdea35be5e0cb2fc1 SHA-1: ab10a0ab830904571967a5a0bb8bc9e311a6967a SHA-256: d275d6e83c4fb0d5a9d728b9b40b952aa60f0481dd3265cdda42faab8ebc84f4
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs pointing to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the presence of multiple compromised links is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=house+party+hypnosis+mod
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ri4mn3atm8heg2vcvmj2b1n8l2/7407284035.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45f1d2f29---lusasoruwosujibonitojiko.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d0d8998aafac031e0072cd95c6f63c34/kugosivitukudu.pdf
    • http://suleymanporoy.com/img/userfiles/files/70404108459.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ppl0n1k3utuc524pb95vjriqp0/guvovofuzazefakugar.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b8802d6c8dd---boraler.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cca3cc81ec96eec8cc94e48303bbc130/29007719270.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/fogoxabiperojajozujajato.pdf
    • http://oilmachineydy.com/d/files/61956947031.pdf
    • https://dannysacademy.com/ckfinder/userfiles/files/kaforilesemeseverazofoji.pdf
    • https://wickedcheesy.com/images/file/nuxavujemonawamu.pdf
    • http://mu-rrrc.com/userfiles/file/28547096174.pdf
    • https://rugsinc.in/UserFiles/files/5197781571.pdf
    • http://iswii.net/ckfinder/userfiles/files/54952379952.pdf
    • http://bjbtrh.com/files/pic/file/retunedevomiruf.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b371204d29b---58920642603.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/bigexagoduvafinulosisipel.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ebb2f0ed0ec708826922c1acd3b9117b/vuxasimasi.pdf
    • https://balajitutorial.com/admin/userfiles/file/mawok.pdf
    • http://guides2alpes.fr/uploads/file/labuzemosekipul.pdf
    • http://drjoecarver.com/clients/49355/File/mubexovud.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/smkmb92fpbojqm7lkp61bjtvc4/kelosabonedoro.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b082d97f1a9---birilavutimotumesumudedix.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273f1d797f---fufaxale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 16792 bytes
font_01_sfnt_off0000e63e.bin
53b8af41ccef41a19237b050f7f66e9768200e6a2ce2a610403a9cbf8fb0222a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 10816 bytes
font_02_sfnt_off0000ff02.bin
8bc2ef1b2507047573b133d07edd620bdc4e18aa22aab011a5f32060b54acd32
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 19228 bytes