Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5018f84a05f2e8…

MALICIOUS

PDF

163.8 KB Created: 2021-07-31 01:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7a4ed0766565663fec51cfeec3a8374 SHA-1: 1e9529a8bf305912b4939f17da2146fb47a24044 SHA-256: 1a5018f84a05f2e8346e531a65cdb15cffc936039901457209b480bf57098622
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded links are designed to redirect users to potentially harmful content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9715

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606caee7ec58b---17968085963.pdf In PDF document text
    • https://nasikampung.info/contents//files/55326525246.pdfIn PDF document text
    • http://palami.by/images/file/96393665646.pdfIn PDF document text
    • http://esangsok.com/upfile/files/56412917367.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f84fa19ec51---sakozizifamesaxitefufopo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348bc3783c---nazajagudadixetukaw.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/novadunusokofilufunafusun.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af175789f5---mapofefidelabepibaw.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/87612505669.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/38553114210.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/054b9ac236d5524ae1bf8911873e5b2f/23636137283.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/54640224791.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/sunajozevofunor.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9beoahehv1pv94vbrjoggt51h5/61039150110.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8c88fe48aa271d89a70031822cb0b170/lovigobegirolemewudixog.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071214f908af---figanamoka.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/138fab05882f603460ed5ec498c9727c/wukigogegasum.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/senizesazigof.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e87dcee71---46531409572.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dbc601f4---linavakovuraxobib.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/48566092364445db8ae8b6d2d46a3911/45605073162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=active+apple+carplay+%2F+android+auto+in+jouw+mercedesPDF 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_off00021c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2345F 19364 bytes
SHA-256: 33a2370f112cc02a87a1c51dd71ee237af18e7e9cbed97312d5f985d6b3828a2
font_02_sfnt_off00026573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26573 11188 bytes
SHA-256: 99e64bef73ed2bd41f8be898a0cd26cbd513db928b29f34f291b42df29d7bc5e

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