Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2c84deb72459ad…

MALICIOUS

PDF

95.0 KB Created: 2021-07-21 09:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7240fa9459d3eebbcc384e0d64820668 SHA-1: cd789459e4634cf019ed7fa4def3d55233ecaffb SHA-256: db2c84deb72459adc8fc32f7888dd508e14f567f2b2025a7e46dd07bec801ed0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/35bc2ccd6fdbe5956b712ac28deceefc/23901518330.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f8efb868455ef6830184427c4ae8d19d/91784260716.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a6730ca4---bizabix.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6e9521902c7e0d12d93a845aac090b23/72753376033.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/viwipivifikufalali.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/79571618284.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q4u53v9nji38cnsdmuoi6k7ot5/jivubakojopegoso.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/pulagupixapasifuno.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed70da48a---bulerisimilonezerorovu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607806656fae1---80221063223.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/11038897001.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/jfsbre9nc2dgi0t6d7ujc2acmk/mibapadeweguvaroferox.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nusukirabelo.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/75732528999.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/9d208cd322bafe345ee8ac0efa4fba45/binimujune.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/lelojusavajadokitexogepon.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/93997555393.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/26547255083.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adae12ae17---silezutabilugegelizaw.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0d23b079f3ff8d6cfd87974c6c6221b7/3696167735.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ebae9d2d2---dibitalowetotajuw.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fexegamorabofizekanakonu.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/busuna.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/xunago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=insecure+about+someonePDF 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_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 10444 bytes
SHA-256: 28976f2db9215fac3804d62b2ce2de078873ebf9a0ccc49f7fb227f36297d1b8
font_01_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DA 17044 bytes
SHA-256: 96f0401e917e76b1364727610e5c6e00bf94c542f12d5bb791abdac6480ee9c3

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