Malicious PDF — malware analysis report

Static analysis result for SHA-256 50af7295c7cf450c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 17:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 428576df682ee842e381a477c5818140 SHA-1: 566fef2cf7242347fb3b9b775e725786cb6f2e2b SHA-256: 50af7295c7cf450c3deaacbae75bb4c9502460b633b4aeeb06481024db662793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=gaggenau+wine+cooler+manual PDF link annotation
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/979458b8a6eb40b1c9493cd04a3b9b07/fiwewa.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3ef69cbf127351746d41ab2a3bdc8799/20959074044.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/xenodosijigilokixofof.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27870526b---72206075290.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb828a8378d---suvorenus.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f0b03621---15033401717.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/63914639029.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/cfkac77m4acb5l4mcbh9u421ej/37611763281.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/93385956904.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/18692271122.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509214855464.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/tufagavawirowakazebawi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4320d1dc03cabee793a8520c1866ae72/61348393851.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ede159e6c7a0ba257030322178d8e4dc/38280884911.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xunemuvoxusufunekasok.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda97b3af7---tavibof.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m5mquja1e8nmeejapg7jdntrm0/19510692340.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/mepukezowenumukaledi.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/eda6bbe03a1a1119e54d2e77f48470cb/fosugolezemebovomegun.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/vowagarule.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/92810195506.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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 17684 bytes
SHA-256: abac4a91ee87064ea677a0b86aa534c3e3ac41d654c51c74ee5689db2ec26294
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10532 bytes
SHA-256: f8f52e61f565d62762f28d24e9b7426025f250363f9706f34c01387f86783128
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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