Malicious PDF — malware analysis report

Static analysis result for SHA-256 7720370a4de6e009…

MALICIOUS

PDF

80.8 KB Created: 2021-06-25 21:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45fdc0a1eee1dcb8ab5dc0cc336bb521 SHA-1: f7671472f34af5e9485f11170031fc0457d8b756 SHA-256: 7720370a4de6e0093982c91f5eeece2d579c8cb099c2a001a0c1735f120cd005
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c4734c410346a906dab0572a5a642491/14927094894.pdf
    • http://sklepjola.pl/userfiles/file/40604868298.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160abcbf2ba1a8---81814079851.pdf
    • http://homelife-superstars.com/image/files/pinojavif.pdf
    • http://villa-carlshorst.de/sites/default/files/file/96904286443.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1401e35b64f47303fbb86ea308633f89/9665292511.pdf
    • https://sokolzgierz.pl/web/uploads/files/34180606419.pdf
    • https://esperanzadeavila.com/fotos/file/lexedugiloguwaka.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tk13k92mrdessqm2sj1rkcf3g5/xonudepopepojaj.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s0tdo9qoknn6qahe4e2nl60ud3/rubusilobanapasebawi.pdf
    • http://dlzj.net/upload/files/20210603003052358128.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5n3rlloj938vf6r8171ijie086/6507866487.pdf
    • https://angkagenap.com/contents//files/86055498241.pdf
    • http://chromoink.com/updates/file/97370260867.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdjpjmlc00rdrnlr9ql2q3n464/94378995178.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796158dad45.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd1997cf8eba0764bd190dcc34a35330/75462734541.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9d47202f---84728663030.pdf
    • https://soudurelauziere.ca/upload/editor/file/10462750694.pdf
    • http://animalscipublisher.com/files/upfiles/file/20975549220.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/479bcd1919ce1286f15b37ad3850dcc8/jasaj.pdf
    • http://extintoresorigen.com/images/editor/96911509546.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e5731c99---72788388171.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/tavefajopugesazasodano.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=journeys+common+core+reader%27s+notebook+grade+6+answer+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 16792 bytes
font_01_sfnt_off0000eec7.bin
185c78f6244815ef2d466d8be6bc50b5a9094d60439a171320ce9511c3a8c72b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 11300 bytes
font_02_sfnt_off0001095b.bin
aed773632367cbd9919a8137a808ee99fbf4e2186a7005f6cf9d5a6aecb44a42
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 16804 bytes