Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b14a78bf6fad1a1…

MALICIOUS

PDF

96.5 KB Created: 2021-06-28 01:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9f119bd70722b6a32e844726a9560b2 SHA-1: eb40f73eab2a504ee17562c27850bff6990c754f SHA-256: 2b14a78bf6fad1a1f0491ef0c6a6072839bad44bfc94d9426adfb1487b23dfc8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2a761561---rudogejevodov.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d055e7e931---1105525246.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e696ec389---92716968602.pdf
    • https://sinhadventure.com/uploads/file/rimorozep.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/zijozapowikewanaraxaju.pdf
    • http://riskhedgetech.com/uploaded/file/505701641609868e653a68.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fe43s14gq9ne88cia7l2jsutj3/fujuziburusanilofobesolaw.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ba784f40a0c811eb22535d70938c3d62/70188814804.pdf
    • https://canionglobal.com/FCKeditor/file/gepukemotalofajududonor.pdf
    • https://aashianarealty.com/file/kufazibalijisekapu.pdf
    • http://grandchainfamilyfoundation.com/clients/85333/File/58463658746.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a5ff420e---zipikaverepo.pdf
    • https://my-natural-style.net/upload/files/gakidulujodibafezukiwum.pdf
    • http://fiumaradelsossio.it/userfiles/files/46232627355.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7cf49acf---85511998325.pdf
    • http://beateromer.com/bilder/file/vumiwamiboxubizeg.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074945317743---58462677975.pdf
    • http://garderoba.sk/images/_file/rekerowazolawufem.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/a6qjk6jcfcu986718lo6s0gmfk/78974191682.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c962ae2a34---mofegotevazudux.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/l2olltuq3n83uv95mkcvv7eoa5/99545453317.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/65108090485.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cd4d37b---51453228610.pdf
    • http://asiadomainstore.com/userfiles/file/miselomuwe.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/3vaedubhphcrg6jil4q2g9qfaq/bokeluxuxoxanoxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=to+what+extent+in+a+sentence
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f00e.bin
369f1c2da23e57a716e5474288185b05519f087fa0651e1ad27e9a331fbbdcb6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF00E 22156 bytes
font_01_sfnt_off0001173d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 16792 bytes
font_02_sfnt_off00012f4f.bin
09a31314602688c7ecc4d6427398c0b188c77e87322ca1b1f1fc0346d03c4f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 17408 bytes
font_03_sfnt_off00015cf8.bin
f1957ff847b5b21307d00aaba18e3192519abc4b264389395342a2e7a2be105e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF8 10332 bytes