Malicious PDF — malware analysis report

Static analysis result for SHA-256 9875d70a2b51e7f3…

MALICIOUS

PDF

67.6 KB Created: 2021-07-07 10:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cb3c7c9bb914e42d2d2a210ccee43af SHA-1: 7778f29df0ae5b54d36149067ed9703e09a3a3e9 SHA-256: 9875d70a2b51e7f33e572cf06dde924c55a134a016541a14fd207116fe784b17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

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 http://goraku-sangyo.com/userfiles/file/nalevobimatipezawuzoxomo.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rbki53hvjtd5c882epci69ecb4/vedufefadesekivowelen.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/28302423563.pdfIn PDF document text
    • https://agatanorek.com/files/file/74199062033.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/36b16a1a184db797478a7f69eee566e2/10439074776.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/20270905992.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8f79481c3---4582479174.pdfIn PDF document text
    • https://serka.com/serka/upload/files/2682725406.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bq7bb3p1u0df06hhfnkqgl3sh7/fupesema.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c063d1d75---panivovomumejigazuxemenuz.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/86ffbb749c5bf63ca1b8879e3972fcc1/puwipizewenider.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b48afd50---65755599918.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/cu1197s8k8297vj76aff596crs/20018726332.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/794850c39597523de34d42430b254866/95045680388.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713ee5af527---76752972813.pdfIn PDF document text
    • https://faprosid.com/file/14795653259.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/getodiwexaxewakezimomop.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c750a90d68---27677611340.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/02m7f85bs7t2ni5j4bvi0scucb/dolaras.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68e27cb44---mejek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=piecewise+functions+wsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE18 10208 bytes
SHA-256: 663d1a6fb0799081cc0ae9464cb4e74726a074f438a6299c55781ea861aca98c
font_01_sfnt_off0000c53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 14416 bytes
SHA-256: b8b30c25e9adab748bdf61091a817ad97a3a8aa3b53e79c4c8981a25b5c41a2e

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