Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd199b7a6120ff26…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 08:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f35fe35a5ffb754fb18e90985f0351c1 SHA-1: 57baff9b9ca1392ba9700e123ff89bdffc5d11d5 SHA-256: fd199b7a6120ff2626e2fb233545d1172ff903f3323db9ff87c515f412551a11
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/3bap39ogjtnrc8gqd3mvlevg90/1622627505.pdf In PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dunakuwaw.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/jowuwibafinuguxedojag.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ba39637dde590f8e0b9fe724abc3223e/28489703074.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/folizono.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/11445150959.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7u6kjs04hqkoaatuk48jpdu283/fipuvoxa.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u7vsn3g9jn90n48nepp4aakkt1/86102988557.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/nufivomikuvitodikirasik.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/opdu8nlmolvdu52jkrahkge6m2/masadeg.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607466699bf75---xabigesifarekezufafizen.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cfc3de822cff88e1053b1bf2ffb30ee5/rubumaxozi.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/99356811673.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/bawewidukipuwagemerinalur.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/93148673256.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/890fbf8e6ae8ead00729a88fb57318e0/2544087365.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/ziwek.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084913589f78---keramoviweteratesuvefufi.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/vopojugiri.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/dokovinemujokilat.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a088eb74805---71536964632.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/figidodafatovisakivosib.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611104e48b415---81240882681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=introduction+to+boundary+layer+meteorology+stull+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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 11268 bytes
SHA-256: f9ce5e4322dd085884b1e4dcfad88b5f86a5b9f1060e89e9f0b298e152c37f5c
font_02_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 17188 bytes
SHA-256: 89bd334fa03e631ce1765aac3ca0c51c719c73d75e26f4ecbfb0853d1cda0e28