Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b3efa9f27b8bbc…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 04:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 208ae09a5433460ef10a242e0d556cfc SHA-1: 189ab1e25d9fae206d62aa4f319e99555355f6fd SHA-256: 15b3efa9f27b8bbc1918b4fce54414205b81b1f38c4bfa03c9b2c05e3ef6ec6e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of external URIs and link farm indicators suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ecohost.ru/pics/images/file/xufixojobi.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/cfab31a4040e5ba09a2d48721c5ed187/91990290425.pdf
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/36980650947.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0hug91mps3h9ruc3bg3coicuf/pidemex.pdf
    • http://mousike.it/img_ins/files/nawobupiwijunalozusixe.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/782f6234fa1cda1a50e22443fa8ca63b/vamevaxonojopakisaduduwof.pdf
    • https://cyberbirddog.com/userfiles/files/68770087964.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae7bc032e---71242800844.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ae727627---58853097886.pdf
    • http://alexhofford.com/temp/files/file/jefimifegepo.pdf
    • http://szao-spb.ru/images/news/file/23606172121.pdf
    • http://fecirturizm.com/resimler/files/88459702684.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607debdb0dc6a---jevitimosabiroz.pdf
    • http://lumieretvie.com/userfiles/file/31363229479.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/836a59d76e8b3e9fbf445b81ffad34e9/javizazosozivigixorax.pdf
    • https://alakharia.com/public_html/userfiles/file/xaxubisibisewol.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/99hctgck2iqm3s6jm4ap24b97r/57396036851.pdf
    • http://afgventuregroup.com/cfiles/file/zudapobarixubokubizopedi.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/c6jhsksb30vd0ctkhkujggo6d6/41479389110.pdf
    • http://hungthanhauto.com/luutru/files/62662927014.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6d76a6349053581e54a367f55e1d9fcd/51627970513.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=five+nights+at+freddy%27s+unblocked+games
    • 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_off0000f824.bin
9cc9cc10808bdd6c1253bd384ebd61422968ebd8bddec5ed9b32d18ba358b4d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 11448 bytes
font_01_sfnt_off000112d7.bin
d9d794946b2d09af59f50dcb3acfadfd5a46d870b576455efccf1f3bead3cfe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 16840 bytes
font_02_sfnt_off00013ebd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBD 16792 bytes