Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7aebabafe2feb4…

MALICIOUS

PDF

100.7 KB Created: 2021-08-14 15:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2df59f8cbf747bb33f6e4427e1d6b4a9 SHA-1: 371e73a81b68343fd09a46e8c7fd6a2b05942242 SHA-256: df7aebabafe2feb4d31825e55d22042b81080ae80d7db93beb0dd19e450ea63c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. This suggests a phishing or malware distribution scheme, where the PDF serves as a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=quantos+livros+tem+na+b%C3%ADblia+sagrada PDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd640eb51b---64196515897.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/82466582448.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0pdjk3814o833ohqh9mskhk49l/38872033826.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/lepuwatedatefor.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/varilelowesureputuxit.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/88c0ceef1dc34053a2e9b617c0329fd4/padifebegamudodojaze.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb12688cfd---27087376951.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c67399411fbc140292eeed697fa715df/xerepewamupef.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1a3557df7d5bf52873de6df3798bd390/xaziwavifumirokusix.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ab525015---kilamufidomojon.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/telogifujoloxuru.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/neleko.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92a9b9df6d---pakurakekafekot.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/21186069414.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c002eda80c---zezikewitelenirapizofaw.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/rugonulevalefemiz.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/fupesi.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/vunuputafijakitepezoveres.pdfIn PDF document text
    • https://isosklo.cz/uploads/78338560267.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb91de7f75---kilujitavulavokalulomanad.pdfIn PDF document text
    • https://labelmarket.pl/data/file/26865946965.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_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 19060 bytes
SHA-256: fce101a87fabbf7351fabc47343cf48f6b78a3405966a5341b7063696ca183f3
font_02_sfnt_off00016910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16910 11016 bytes
SHA-256: 52905aaa89c075289219c4977e95c1c90338019b53e70d5d53ba68e8a6fdf1b4

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