Malicious PDF — malware analysis report

Static analysis result for SHA-256 27207490b08a45d8…

MALICIOUS

PDF

82.8 KB Created: 2021-07-08 08:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e497d16845233b6ac813315dff60cf8e SHA-1: 0abcdde9b81644b2ac7c3ac7466e544e5658da84 SHA-256: 27207490b08a45d85242ba724de236245d26df95de9194fd2017d1be73d96a29
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file functions as a link farm, directing users to various compromised WordPress upload directories and disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5afbe400dee5b45013edf52cdb544fe/kobagatutaxab.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368b89c4ed---taximoriv.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d7c0b182236a97bbac4c60f2235e4a8f/86445521750.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb26e0bbd---28999139498.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6c0ed0d7a265cd62a24cf2bb082b5ee8/75393964449.pdfIn PDF document text
    • https://energooptima.hu/upload/File/pesub.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/55620292876.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/52093029608.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bab18ca97ca---nubanelekarigibuvojiniwax.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ef78d1d659d1dda9e13ef09116bdbeda/18417306904.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/webilij.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b84ec75a0---tunutagupomu.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/83833535536.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/92544592034.pdfIn PDF document text
    • http://poiskvod.ru/images/file/32402839945.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/52974991291.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/worerakoti.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/47a7183f80a6c4c4b607ca7e2528c6f4/wikakagegegupow.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160774fd9eb3d1---noketudujofu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/zunijizef.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cnlv36n3345kc5qu3k025boefr/sokesezeputas.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/4597134634.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/xodizuzisinep.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/718006daed88fe5d06d9d58c12ac45b4/piramivabutopaxupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=restaurant+story+unlimited+coins+and+gems+apkPDF 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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 11208 bytes
SHA-256: 5784fd4c075b8e91be6d599970ee2b0ea79be876e86d65c47fe37ae9ed3b6181
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 17156 bytes
SHA-256: cf87872aa04d5c17a64a1d688e23a34fa09f33ae3a22f410932930f595d2d304

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