Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e91b92f81d86fef…

MALICIOUS

PDF

82.7 KB Created: 2021-06-27 05:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c7a9be37687f9f307d60fe641176a8b SHA-1: eda944605a36f69baa0792e0a21934f465ee5865 SHA-256: 1e91b92f81d86fef810c01a53ea4249c045bc923fe5906fbdac543c7307fa467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, many of which appear to be WordPress installations hosting malicious files. The presence of external URIs and link farms suggests a phishing or malware distribution campaign. No scripts were extracted from this sample, but the overall structure and URL targets indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=positive+words+with+letter+i PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7115a42ecd---wagubukirejakarado.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/viwonatote.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/faa1250eb5516318497f49de3fe24d9d/78775386867.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/43435171247.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/tvsep7j5l1kqdlrlrhebv3su69/43403826840.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2ca3f61626e25116fc828c8739990e41/silovarokagirisaxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c330238ba---55246747413.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7b877a886a88abdf86bb28af0ac5c0e0/72937009396.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e3172a4a---90118436521.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7428c0618b---93619943853.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abb2cbb4b---752246799.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/femomasewatujefe.pdfIn PDF document text
    • https://papiratisk.cz/soubory/sezabos.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075888c42485---xaxebilubiwisaxok.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea3b543c5---dimidiw.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/pouh6c8244ov4t4cg2ciph3r86/26360036016.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3fff8929ddf17ecae177c2ea73f79b3b/bawupodikizeninowokur.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/029culo4kljgpt3dp428e4kpoe/62336770538.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb7ff39c9---22709128621.pdfIn PDF document text
    • http://ipublicity.cz/data/file/79994837300.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/22992235431.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/4550pikv47lh53kmssdc21uov9/zutotoxegupotelafirugi.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/tewidisozawaposa.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ac837daf---14101160342.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/8237936705.pdfIn PDF document text
    • 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_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16912 bytes
SHA-256: 9bd012622221f0f41d204c24b4223bfc9b9eab04c1b55bdd2445a45efa5b4d95
font_02_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 10232 bytes
SHA-256: a40ba9908477c0a6c9858aaf1bedf9ec4631158a8928e464b4740643da48b48a

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