Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8e59ea1344fa7d…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 14:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5beaedbb84d11a2d22b4d05489f3f8d SHA-1: 714a9fcf7f462aaef36d52339b13621fc3905653 SHA-256: 4b8e59ea1344fa7d5dca69ab44daa24934818bc2ae85c29053ae9545946cd98f
116 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external URIs and a link farm suggests the document is intended to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://atek-ent.com/upload/file/duzubifeganinij.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083323fb6505---81356911946.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/93447970209.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda673bb270---37380813118.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/65074414092.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5j3ukgsjubvp7nbmgb1n534fra/bazilasiladat.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/46268682968.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/jasaja.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/17678572650.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rjosjgcsaq6jkbp8tvoaf3fhpa/pubot.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/21788227249.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/ranegavim.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/95659422831.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4feaaae67---96770460098.pdfPDF link annotation
    • http://hotelclinton.it/userfiles/files/xuson.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607843a724e7a---54017765255.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/7062657580.pdfIn PDF document text
    • http://abnicum.com/files/file/79638123540.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/1b658c201790d85c980db0ccdbed684d/denolixiwu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/28751280698.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/kumanilavobikaxu.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/losusaralugetaliwevi.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/woxofizalerorowisigoduta.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/pepofesexesemudesowijo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ec61884e314b3f93cca0b75cee5aa6ad/pubefet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=example+of+student+resume+pdfPDF 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_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 19564 bytes
SHA-256: 02cfb4ef163225cb2b7a71809b3018eb8b14fac0b9e38ac8dbfe2b69e56f7875
font_01_sfnt_off00013876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13876 10752 bytes
SHA-256: 3199894d9db24e33f0b21560c7c80cc34080f86563d3803b04fde1c3c2f5344d
font_02_sfnt_off00015130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1