Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5629f1cf8882f4f…

MALICIOUS

PDF

124.6 KB Created: 2021-06-24 16:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4b791bbeafe388ee3e4c659c2e2fd4a3 SHA-1: f6b848bdef7f6361cd82d5e2ee0ca26e99399961 SHA-256: c5629f1cf8882f4fd5bace3f2dc1a040e68ca616d570e6cc156c1e2bb56bc2f4
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 https://crysiq.ru/uplcv?utm_term=list+of+all+spirits+in+smash+ultimate PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0a0014fb179997e8ae8c2a401ef1b9c4/bimuvaxofebiwi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/37524820367.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086c38352860---neforomufefire.pdfIn PDF document text
    • https://anup.bo/images/files/85362017112.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/74052573721.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/kutopixewazubulu.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/25202323693.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95859391d---wuxolosatalaseroridupo.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/dolizozu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b8951aa73---nuwaniwotujadigurux.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/53001590758.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mm0aam03r1u7l8lhj6001mskjc/12162297056.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087c8ff6f601---xofifokenivunoguwitofun.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535c26628---25334843744.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be4e8892e---gobanowirus.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc661ffa6---jafajipojesujabobuj.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f82p0dd01hq0tjiabnfpm0fl93/4208822342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000174a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A5 10920 bytes
SHA-256: 2fbd9cac40a7df3d2bdf119251e52108b71634aa6c3d95cc07fb03a21ac66ad7
font_01_sfnt_off00019879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19879 5084 bytes
SHA-256: 58b4722b511b54d5348de0153dd64ae276a86554a2145ab6d1948d39a9a13b62
font_02_sfnt_off0001a992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A992 4892 bytes
SHA-256: f68eadcda0c37fe9cb01848a421fd63452711e459d82b1d3a6ab1044386eaf29
font_03_sfnt_off0001bb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB3E 12384 bytes
SHA-256: d2d5a070e6fd7e28cd02f380df22f3d35095ca2c0c4cad25b30b2e934a7ee33e