Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c1f390fcafdb4e…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 20:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8fc875d88b1fee3fbd20ed4191dd0c0 SHA-1: 48e83ff4ee35453c99fff66134154ad099b2f1f1 SHA-256: e2c1f390fcafdb4e25a12ae758f9abb6774d847f722371775ecbfa66e7e6c598
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it contains algorithmically generated URLs and links to compromised CMS upload storage. The PDF structure suggests it functions as a link farm, directing users to various external websites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=android+simple+notification+example PDF link annotation
    • https://akamercedes.com/images/uploads/files/gaworare.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/57979139961.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210921_030323.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/midawapu.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/medagevediwuzo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be8c6f520---64629821268.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/bigimexadovogezuzapor.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3a3c8a5ee5c8d3fde142631dd71db4eb/rufupit.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/70815487838.pdfIn PDF document text
    • http://www.centralperdana.com/file/38882469950.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/fujije.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16140971ee4ce0---fibinokezilugomuzexido.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vufusedejef.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/70082579676.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5c30c792efa09b82aebb719ea35bd6c6/6182505039.pdfIn PDF document text
    • https://kratky.eu/files/file/dosugewesofoxi.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lobowomosoborugotexat.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/lobatoz.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f814b5a608ec8e1d3e1ee18fc4354b06/wajudizap.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/pekozonizonevezej.pdfIn PDF document text
    • https://12shio2.com/contents/files/tiwaxojarevi.pdfIn PDF document text
    • https://finliz.lt/i/File/19380780183.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/mamomatizefezonu.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_off0000adae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C0 15320 bytes
SHA-256: de28b2c8535ad454076747d49b5c0c5bde63c1e9c3814ae93c24d332f3e24d82
font_02_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 10864 bytes
SHA-256: d2f2f4d36ae59cbb497bcecbf294896d372c82b9cb06d46064c5519e35ea2a10

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