Malicious PDF — malware analysis report

Static analysis result for SHA-256 a811d0962de4a0e1…

MALICIOUS

PDF

97.4 KB Created: 2021-06-26 15:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efbf3d262458b6464acb1d8d4c325b42 SHA-1: af40dfa608d3646447a22f01d223fec9b5e9f1d7 SHA-256: a811d0962de4a0e1894009dd9f31fe96dbe4955678fb7c1f4106ff26d6020e80
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160802a26ec042---dasuxoka.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/jotogegokina.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accfc45596f---20566054457.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160976ab90995a---42473474308.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c817b1e21---dinipiraz.pdf
    • http://www.ecvbrass.ch/user/web/file/sikepisikajamo.pdf
    • http://dlikefulproductions.com/clients/875850/File/toxumunamab.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e596c9bfe5---saniluwopagafuribaxoz.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a0dafbf2---jipoja.pdf
    • https://termofriz.rs//files/28985245542.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4suc4dhslfjftrduk0754sg039/36215830181.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4b727bee8f0f59bc39b0fc87e2435323/35532242528.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rmq39pd30v1dk6v5jrqoh21os3/95968255007.pdf
    • http://chouchoudauphongongtay.com/upload/ck/files/10281701288.pdf
    • https://papiratisk.cz/soubory/81004404591.pdf
    • https://alzubidi.com/userfiles/files/87075929054.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/694863505a00dabf315260d020b144ad/5638425720.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071270bd2820---morobiwef.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089b34d80c81---jusovuxadatikubada.pdf
    • http://www.yoko-ono.be/images/userfiles/file/74820810828.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/taaiu280bok6c6c88m2nkg28kv/vesimovozebojuke.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c25adf3b9---18134860846.pdf
    • http://adveotec.com/img/file/39850229560.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea6b7861f---26019125606.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=feeling+remorse+meaning
    • 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_off000113c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 16792 bytes
font_01_sfnt_off00012bdb.bin
1d798cb2ea4477fc9a5a2799c7bd384cb90459d44cc689e60279b6cf5e7ea974
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 20748 bytes
font_02_sfnt_off00015f43.bin
a778181fbbd8d39f38122953076b142f5f57b158a18a559ba055ce5486c72db0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F43 10328 bytes