Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86ad606c5120307…

MALICIOUS

PDF

94.3 KB Created: 2021-08-15 14:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b57f478306311936649e29a166051070 SHA-1: c2873d4f4e5e2b35ceabada29b4313191a30bc13 SHA-256: a86ad606c5120307fd0e7b325fa460de3d8101ba8426feebd1eab0bdb0065690
212 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and instructions to disable security software strongly suggest an attempt to bypass defenses and likely download a second-stage payload. The document also contains a visual download lure, further supporting a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bu9tqnspr2955hpsigehhb1fn7/nesaduro.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0575c80a6de96a271d2b4df843850593/luvixududakugij.pdf
    • https://internationalmedia.com/userfiles/file/37041485413.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10bc3c910---42121778742.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/odbl1u8ehvuvsmedcsn1lm56s7/xowij.pdf
    • http://deltastal.ru/userfiles/file/48186211478.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/fa1d49fae70792895bcc79cd4a8c53f9/wumotiduwilasupel.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4dd7f3232371a85fa6db5a1e531f6fcd/pagojapepamokebif.pdf
    • http://esipro.fr/userfiles/file/39297727741.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4745d7fef---5949324903.pdf
    • https://contabil-fiscal.ro/mm/file/sikirurubagegilopamut.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/clgp12srll40ha338s9so705b1/gesesudedozigabun.pdf
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/lirote.pdf
    • http://aircond.md/upload_fck/file/47736382188.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/5pn1fhctfc7adbeearut6v3v1u/pobisenixexirulew.pdf
    • http://jeyadhurgatemple.com/userfiles/file/gewuzifikarefelebo.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18f9e35cb---68948312792.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e6740a37e11602261a8871ff6edc6926/65467548662.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f3b86254---17349156507.pdf
    • http://self119.net/upload/userfiles/2021/07/files/210730013352.pdf
    • http://shophouse.info/images/files/98615813797.pdf
    • http://luatsubienhoa.com/upload/ck/files/54131061049.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/73869742965.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/xomirusupinuzimapugisewo.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724abe339b4---28993130420.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=five+nights+at+freddy%27s+4+unblocked+games+hacked
    • 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
font_00_sfnt_off0000efc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 16792 bytes
font_01_sfnt_off000107d9.bin
c797468fd1bcb08538a0361fc82174ca06ce313a4396787ee650c224aae45b68
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 11524 bytes
font_02_sfnt_off000122db.bin
6f3dc255f0a7b766d49eb2b8dc088dd460f557f20d862164dbc0f1ecc22c1113
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 17716 bytes
font_03_sfnt_off00015114.bin
470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555
pdf-font-stream PDF embedded font (sfnt) at offset 0x15114 16352 bytes