Malicious PDF — malware analysis report

Static analysis result for SHA-256 a964268e970faa82…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 12:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 332a9a52013ee23e46807fe87105adc5 SHA-1: b945f926762774c5cceac61f4fa0c08f11f84ae4 SHA-256: a964268e970faa827df2e41cbe3d341639415aec556c5ab6a70cf91e96bc3931
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which are hosted on disposable domains or use UTM parameters, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports the lure for users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d376de94e---31727717109.pdf In PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/534mgkmnbk4irds7etlkvnrs21/43561119628.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860fea5f9ba---87518476692.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a11335d8c0e---88194243784.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca77e6a98---14691703048.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4c864fbc45f762b809e582e455155ea2/falela.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/welitivuvebapiruv.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4810fd3jff0vc2h22svu7ehom2/dolitunopexuvalava.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/12476626031.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/gobuwibatadujazirujigivu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c99f4876b3---fubita.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6sh0don8hbjgujcp5a3gfjk8ki/lavoderupitikumewobud.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/80747945080.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/206639122960d2ae1b609c9.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1aae5bcce9a85825716c01b3a1fe45/75195643803.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7857b2eba6---71726120875.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/12217896677.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/906fb9eeaf18bc166b6e3474cf162c05/lozuleron.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/bae1b4116c1727eb98d70a309db3a39e/nexusifonukifizur.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/55d5c0a41b6e741c37c028be3f7d50f4/97350166691.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b153941626---8558943309.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ctrk2jh4l4kiq273rclfrlo5oi/96059828390.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/89262925619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=east+west+hollywood+orchestra+rutrackerPDF 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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 22444 bytes
SHA-256: 02e566e683910be9f37f8371a14537cf3f86f5cb2a2e510d3529e8557e14392d
font_01_sfnt_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14147 10644 bytes
SHA-256: 6b1ebafd40110754a97e763c772724ebda80090945ee1ff301807b6e9c66b1fb