Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7e54f4cc0f47bc…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 18:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79816b92adff05c50cbc2e60e11e24f8 SHA-1: 2ae68bdf75cce8aa8eef6b30a6c6a7e4446e5830 SHA-256: 2d7e54f4cc0f47bc1d77dfac1e3b8d043ae9d34eb41cd193095b1b197e8dec73
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://standardpromotion.com/images/upload/userfiles/files/73384376134.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30309235d1---22809545304.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zefewapetipej.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f4a4a855733494caddda10eebdc36667/bipegenodedubatiwoz.pdfIn PDF document text
    • http://ridendo.cz/files/file/15183200569.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/kitolodunaletufaxifoxofu.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/pewovarasidu.pdfIn PDF document text
    • http://oodow.cn/upload/file/2108081446354013093bjk87sxms7g.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/nujexapelojanezipusona.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/ruxuberituzajizu.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bn89636ott2j8eu9jbqvc7dk25/24559146838.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/68858762615.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/pawesoviwurovimasuxukabum.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/puwejefasirikopele.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f10ae0b5b6a6ea2a9ceb87a29bce213e/64125790916.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vaniba.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f801510eff39b75f97720d5b162730ff/70976729395.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/vajolawusibarojevekugo.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/44431772588.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/pajejusiji.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d643110b38---29643563010.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8be9b57c---33673387047.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/44684152756.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/13202879536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=schoolhouse+rock+no+more+kings+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10868 bytes
SHA-256: 21481edc9297e7046b70b96c2150bf7dcdb98c33a994a99dc06402b321330c9f
font_02_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 17448 bytes
SHA-256: 137fabdf4c6b0d05556fd91c72a81ca7eecee352c58fb51be78bae0ea46efadd

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