Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f38d60a6b3fef66…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 00:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef0a4996355c703b60db341d012de7de SHA-1: a1d1586fae44915cd9d4c8d7b9620df4ee992456 SHA-256: 5f38d60a6b3fef66711efb21022207a2cdf9c62fb7e59b84dceb759b2502c2c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=compress+pdf+size+adobe+reader PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607455ec7ac97---80667173273.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/zojujitoseji.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/51122708538.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084075e54504---55264916408.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9b0408bb---96227951425.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/famizovelafekadi.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/30903543113.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/65a7f769e5bff50e689b4e6a8aab0b67/67150889150.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o3dldlr3b1afdnjbujadrejbe7/67061776846.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/pifamako.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4297aef4cd2c864185229639090cc44c/fumagel.pdfIn PDF document text
    • http://indecomavo.pl/inc/wufosi.pdfIn PDF document text
    • https://dptech.vn/uploads/files/fazamumunetafikuki.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b4e553184e871d0435657d5101f6d8ea/rofupegiz.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/10393675557.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/wesiwovezumigimi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ivk4gjl5k051k9i1t0c2fsok0j/kevilixojekob.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f596885e5c---45556436749.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gddgoss9cggi66m7bas6k0897a/29588289682.pdfIn PDF document text
    • http://ciskmv.com/css/file/92977441904.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/12165537362.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c7791e68---supipukikadikolavasotore.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/fapas.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/womisajopepowijekosalopeb.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/zomixemopab.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_off0000ceb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB1 10640 bytes
SHA-256: b0f0e6aa93c26093abf74b227baa3562d3f4de71c2a200ad6a0b6593f6fadffe
font_01_sfnt_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 16872 bytes
SHA-256: 80058f9481e0b28764b4145c339c90cbf24959cbd3dc584d56125cbc969269e8

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