Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6261a484cb6417…

MALICIOUS

PDF

98.9 KB Created: 2021-06-28 17:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ad69f816ed47ccbe5cafd200a68367d SHA-1: be28c2a4efca50a1c6943718b7c642710397606c SHA-256: ef6261a484cb6417fa0e643df54ad30829284576d2faf302232d4caead991ddf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The presence of numerous unknown URLs hosted on potentially compromised infrastructure supports the classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540489f3a2---29788539109.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0e5729cd3f5035d5e5ec3b5878deada3/xigikopusazu.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/95160810038.pdf
    • http://adaviestransportltd.com/userfiles/file/lozekasugomesuza.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fe179eb629a20c6d6f31e8cb5404c07/raxajexaseberakow.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c614b2814---sejolejenupa.pdf
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/51069163265.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/243d095a9d033dd7bf940d641d7dcf89/nivazibu.pdf
    • http://nessium.fr/userfiles/file/fosapodiv.pdf
    • http://kielcenoca.pl/files/file/lubalatolegopi.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160828a318cf39---7338230511.pdf
    • https://mokhalasati.com/userfiles/files/ruwajafenovotanerovavinod.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a290628e982---67178362000.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a71344e8450---18892654292.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5mc8v17eassvi6lfrbpgerl4c5/kelizozojuviparutazovuzo.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30236188639.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ml18nuj6nbrhpq8amhf0mlt4m7/labisowisiwatakegajoxaz.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c530e207729---ropuselafimosenatos.pdf
    • http://dermaktif.com/imgup/file/kijupamefirapigeledima.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/488c610f35396d15e05388317bbe0c8a/91326909246.pdf
    • http://dokumsuzgec.com/userfiles/files/73759980249.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093c5c2dd0b5---91727486113.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/a1hi1tipgc5iff13163n0npm31/vowezukajitu.pdf
    • http://perseverance.cyou/updatefiles/file/kozumuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2013+accord+coupe+v6+manual
    • 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_off00011c14.bin
10f819025deff102c3d94a1a6a6b7064312feb9a3d98df2c5909eac176cf9e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 11020 bytes
font_01_sfnt_off000135c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 16792 bytes
font_02_sfnt_off00014dd6.bin
b4444a1c75b946da8f6b53a5287878b11d4d583ec2c0373a4373a8c3e527ba0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD6 18388 bytes

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