Malicious PDF — malware analysis report

Static analysis result for SHA-256 df932d50849aef96…

MALICIOUS

PDF

107.2 KB Created: 2021-06-25 14:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02ac5d40cef7847920d695b567e0a648 SHA-1: 8f18dd659373bf064a9a522ac9b105c711623ef0 SHA-256: df932d50849aef9609b7409adb9715971de03b5771e2c3af27152548f41f51a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a link farm designed to redirect users. While no executable scripts were extracted, the overall structure and heuristic firings indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aurorabersinar2.com/contents//files/jupefunumiko.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c846548521---61042375419.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/e8c7a01ef956d3919f85543d6be0ea93/85029709875.pdf
    • http://wintec-samu.hu/uploads/files/54660673633.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609181d03b83d---jebed.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/feduluwijisimenamajobuxun.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af44298833a---xadozavonixunepo.pdf
    • http://msamerica.net/clients/873634/File/mofiwakubapewesejufak.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb3a9c4ab---dedenunezipaliz.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb35fcd654---sasabud.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/979579c7d90a5edb085aa990859b414c/jipamuxezamanofogoxuk.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/20733730102.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608612707c65d---ponudigoluwakeg.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2c725802fc370d4045d5e4599f962c8a/xeximodolonekixokezu.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/sqatbgnjbg3p7qroerncebusqc/tefupubekifuruxapi.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ernl3ioq6td3kgfo3b64oo12vo/pudotuvomurumufuf.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/heo07nj7mmlaqajj4cbdpqejg0/fapiduwefivupon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=spay+and+neuter+vets+near+me
    • 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_off00012752.bin
ab3c8fe9c5be0756477d89a19cc5428ddbbf1107301f300f2adaa61a29549c6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 18884 bytes
font_01_sfnt_off00015888.bin
4b430873c1355c07a7b6fc2a85d497e3939b341190f8238bfefd207250e34e94
pdf-font-stream PDF embedded font (sfnt) at offset 0x15888 16516 bytes
font_02_sfnt_off00016f55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F55 16792 bytes
font_03_sfnt_off0001876c.bin
9ab19074b32c8d99c6f369f00e8271dcc1a1be1b187d7e1d7abba7370ee92fe4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1876C 10648 bytes