Malicious PDF — malware analysis report

Static analysis result for SHA-256 afecb96c6d3c6516…

MALICIOUS

PDF

121.1 KB Created: 2021-06-29 13:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 83e290306f60374127edbcdf807b6516 SHA-1: 2401118244ae3e9ed6344ac0844330af7d9977e5 SHA-256: afecb96c6d3c6516b6ca5c5d6f3a39cda207d49edbe41c439ce7aad2b3fe7197
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. The presence of numerous unknown URLs reinforces the suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607426ae77244---46584689560.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7195db19---zanabirefibinupejukej.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/dojanafasi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/n4vqgfvi0f6s8lf6slurv77pn6/muzugakuzevopuvod.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/zugaforuruluj.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/81428636210.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/69137876005.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/3okol3ceisvu2o831go3kvlhl8/kodijeneferefepolilodobox.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/wulinarupefore.pdfIn PDF document text
    • https://tessuno.com/upload/files/60d76e71e9b89.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qvtgg78219pbg5nnkdsbt0v6mg/53784773275.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5af0cdd55---12496352251.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071b665ddf25---jofekuminuredawofetitesod.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/wovezaw.pdfIn PDF document text
    • http://renknh.com/ckupload/files/281069095.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/85839828950.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3atfhpqprmch0jt3lj4o8r5989/31889543624.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9ba0c126fc1de76414b6a440d37a47ac/39919385497.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0ba031b66bca1c610e249bbb1f36643a/wugonimejazaf.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/berefi.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/6783008908.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/342831d6949a9e067312fc3f8bd752d3/50774509896.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/95618985062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=average+bmi+for+adultsPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15215 18300 bytes
SHA-256: 6661f457ec888f234e51bd5752e69017a739ced37b8be764074b536ac8321010
font_01_sfnt_off000182ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AFD 16084 bytes
SHA-256: d11bfa2b02c462a3f9075532ce7ec1132ca3691ccd6a850e0dcf0119a218c04c
font_03_sfnt_off0001b036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B036 10880 bytes
SHA-256: 8a994b7f5a71c6c2b4f846d31766acf2ad466c5426eddfa92c7942a0836188ab
font_04_sfnt_off0001c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C934 3408 bytes
SHA-256: 461dc7d93a682042f7c9f340df4bd418354e6bbe587380d5a92a82d3b0298684

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