Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f6b2c05d40a634…

MALICIOUS

PDF

86.8 KB Created: 2021-07-22 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b70cd9f8623840e735c4db0dc146ec9 SHA-1: 5365c59cf38ae051f5103fa150e5f8fc35ac5b71 SHA-256: d9f6b2c05d40a634378e7b6d34b5c9d732bedac3dded1301caa6da5d72ac058d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://93564497.com/userfiles/95272540520.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b084474f0---xasotaxopa.pdf
    • http://domholidays.com/userfiles/file/49456371897.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6b6129de92a4f3aa093aa411b50b45e8/dekexaxeloxufikoni.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rnc4p4at0pcaspmknd0a3tsssj/wutapibazurigole.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ef37a83fb---lidezogilimitezazovipa.pdf
    • https://ahha.az/userfiles/file/vulinipijuruzedasosutil.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf7db138ea---50731937700.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a65a13aec---xixoduzugajitivanuvumo.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080b988e4cbe---60148235814.pdf
    • http://yoron.net/up/files/72101971717.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3aae8cf2d---84637971226.pdf
    • http://www.bluewhaleline.com/image/upload/File/81380284363.pdf
    • https://beaszemin.com/files/66467428398.pdf
    • http://sunarfactory.com/userfiles/files/90923336604.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/vudur.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15651a17f1---dupojafuzezanaguluxejif.pdf
    • https://ctsgroups.asia/images/file/jufotowiku.pdf
    • https://anmoul.com/userfiles/file/69798003363.pdf
    • http://sanga.asia/userData/board/file/jimapexe.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/396eb8154b0a9680e0ece74332d6c5b5/47621242469.pdf
    • http://ketoanaca.com/uploads/image/files/nuzofakifu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd84162fdbb---8511745911.pdf
    • http://bafiti.com/sklep/userfiles/file/sabedofeferiwaserimi.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb8a7649c---jokigesevevet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=drawing+competition+2020+september
    • 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_off0000ec93.bin
0367ab34e7cae04f2bb4f1391ed66779c7e6a9cdc330160ad589577ff3788e2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 17708 bytes
font_01_sfnt_off00011ae5.bin
a979acecc1870e25c28278882e442c38bfab04148378cc6d00878589e5ed1e84
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 11140 bytes
font_02_sfnt_off000134d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 16792 bytes