Malicious PDF — malware analysis report

Static analysis result for SHA-256 558282c67e273141…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 10:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1f55c37c3e1429a049b5e207a15cf3a SHA-1: 1cecc9513b08a42706bd9f4762413511bf244f26 SHA-256: 558282c67e2731411b54882831c1a74d6ecb065e73c2e56c61a423b333e6427e
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 of which appear to be hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the ultimate destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=factorization+worksheets+grade+6 PDF link annotation
    • http://kiuanai.com/userfiles/file/wosaguduvag.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/vitodozonemes.pdfIn PDF document text
    • http://samtle.net/ckupload/files/42031293499.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611122de61bf9---31605964997.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/zewif.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/77983136804.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/difoxebuziwoxivarive.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c462826991be9ec7b3465ca97cfc83cd/81234199418.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/3d3ff433628b35d3fafb496948adfe89/68481496785.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c190efb796fe944c56679cfc590d7437/jumorotaxedikakegibukeg.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a5c415aca0fbfb66a11c8f1e8f6bbff7/pulerelixemuzit.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/wimagivusajomedurivemez.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/limujasalox.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/g74de5ts0q9tq4amt7g5j4flda/59397073439.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/dogenaridiruvavegexusivaw.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/28424920102.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0592aba4beca4f3ba241f8cf6a5bd9b1/gotinafexapegedabofe.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/17070866928.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/43ntt1e35i2huoaq8k2glcdko7/fuvamiwi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e829d224bf---38651773923.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/16e799387de5ede0e68acc35bff9bb53/30543544389.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e912615b5e1---baxizef.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/rubizume.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/lr52460v51lngj45voda7agi53/80202599795.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071af5e9507e---bidufalepawixofubowexepo.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/bifodubomuwobifivubenog.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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 10984 bytes
SHA-256: 89367d40fb043403e29de35f6609675f432c1f3ee9f32b78186249ad52b0dd7b
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 17544 bytes
SHA-256: 1df4df9c8480238617a8ab1684323db04f6d2d26fce5c3c418677b75394152f2