Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cda6a513b534ea…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 11:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e130f83557f010d2d626a05d0179aeb SHA-1: 2f874546a4e1d36f91b84759b4e7b066664b3282 SHA-256: 34cda6a513b534ea4f972f53bb04579ee121fbf89977652052b22891a579c36a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=new+android+version+2020 PDF link annotation
    • http://smartvoicecom.com/userfiles/lanodulul.pdfIn PDF document text
    • https://netpage.info/userfiles/file/bebuwavapibaluviwepo.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/57095712099.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/sipemogogo.pdfIn PDF document text
    • https://heyratacademy.ir/file/93334459063.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613418307ad68---xatujikodafijulafibepi.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/86411447888.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92258567be7c39cf4969c3663c19ba19/60873637021.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/77457072808.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/seruvexosaso.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/lowitog.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210904081244.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/54502782698.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/joxexewimivobatebodotunu.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/wubute.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/6657910235.pdfIn PDF document text
    • http://agro-partner.com/Image/files/sajidagovebiberijadi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/po2g1jktrnt3b6u0uo7jo2vm71/durofuwuwowode.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/60826624891.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ogandp9dp3aqvtqkfn0ahsq9p4/guguwavukab.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0c8a4e60879acd91d8b12d0b423aaef5/miwurisuzamutigemiwoloxu.pdfIn PDF document text
    • http://salespate.com/userfiles/file/jupowuw.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nibozaxed.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nosimizeguw.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_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10468 bytes
SHA-256: 65d2b8c9e91a1fc1860f24bb617a5cb37eda1b26d4076e298842964f9f1a42b0
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 17536 bytes
SHA-256: 61ec3df5cbbc3c861a38d05a6262db724c9d9092338d14d137e118887c7b7a24

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