Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f59ab63a5500eee…

MALICIOUS

PDF

76.4 KB Created: 2021-05-29 21:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2239dc08a4e36a3289902993d20988a8 SHA-1: 5259c8253ea5e2c350af4530e9b02ebf875d8ccb SHA-256: 8f59ab63a5500eee65e82f7d44bb13e44513d0640d42406e73daf42aa0558d4d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are used to redirect users to potentially harmful content, aligning with a malicious link strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1b885d3c3c455f3fa6474d55300ab6e2/76462922000.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f5c5edb71e14779aa196260473f17f00/54980511173.pdf
    • https://mangonebike.com/uploads/file/geboti.pdf
    • https://tedvandergulik.nl/userimages/file/15859719020.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s3fl038k6e4duovsqn1ffhkcdm/boguvidovaluparewe.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609936b15626f---nabaj.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160922440db954---patepe.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/91a0a0d5761b01f62e94355b434a0524/likegivukikawirawola.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a61f9aeff594c31813dff570d47c5acd/mosuvopijotubasidelonexad.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609414e8aacc7---tevajajiditodajejavo.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8b907907---993150411.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9eb6098bc98d87b8a97163b2c125d84c/zijobimataxoxutakudona.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072761e229ad---67594910254.pdf
    • http://airconbank.com/upload/fckeditor/file/xujefimenixegelid.pdf
    • http://mariopresto.pl/userfiles/file/90816398726.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3fd10cfba2e372c7dde9cccaf1fc624d/52909002485.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085442368fa7---xefilufusafisiw.pdf
    • http://dlt-nkp.com/fileupload//file/78076361496.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=writing+null+and+alternative+hypothesis+examples+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde5.bin
97c0f2eecf864bcd1f076cbbd2212301fb4bc5d6d5e243a1c3b4098585d12ee0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 5580 bytes
font_01_sfnt_off0000f0c6.bin
dcd927fb1b526e98587dde2722ae6ed17ab852ea72edac141f1c704cbe89817d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 10900 bytes
font_02_sfnt_off000115e0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 4324 bytes