Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2d52cd168990eb…

MALICIOUS

PDF

91.9 KB Created: 2021-08-03 09:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a2cb298df205002b522ac6656c11b80 SHA-1: a0b3b9c33631f1af876eef70ec0e25c6e9dadad5 SHA-256: 1b2d52cd168990eb6c391a5c34dba08b5ae7c4e468166a370b26839e218c692f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The sample's structure and URL patterns suggest it's part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=last+shelter+best+formations PDF link annotation
    • http://s2ipower.com/survey/userfiles/files/bewigiboxozurok.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ae314a786d0d986ad7ac6852a0f576ae/17138800725.pdfIn PDF document text
    • http://pk.mo/userfiles/file/gigutafo.pdfIn PDF document text
    • http://emannsltd.com/userfiles/fojafanuzowaluw.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/33431145546.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a001e364b8af4ae3b1d51f7e2239f6db/rukexududisafa.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/42c6c6d6493df3661485435ece033d7d/66325243111.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fddd49fb5b21cc2b3b2c830574801ef9/75812219302.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fa0742f5a---raxozolis.pdfIn PDF document text
    • http://talleresjpg.es/img/file/3093219533.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/92643782104.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/1539701843.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/fazatizalupedinivapape.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/lulobujapovetirapafixi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/12305434997.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/nemoledinoxigukuk.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff2e7ac919---xafikujebupufirox.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/20996611606.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/debazalawopul.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160df2a646bd47---wosoju.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/pozutajire.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d3ec4ea4---91469128288.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/91758035175.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210727/16273173819255.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_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 17484 bytes
SHA-256: c167d48a167913e53fb39b987de0b261cbee0778bb08180b10b87c8db9b9a50e
font_01_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E1 10576 bytes
SHA-256: 839a9783a0e7a6259612446f57dadf2a6386d8123ecc3814f11b9e279cc159f5

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