Malicious PDF — malware analysis report

Static analysis result for SHA-256 a788f7f97fc584e0…

MALICIOUS

PDF

79.3 KB Created: 2021-08-15 23:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d70ac067f38a92143b29f9927549e375 SHA-1: bb08897e6e7ec931b7f8b6c0a5fd47340febad1b SHA-256: a788f7f97fc584e05c343dbd074873a839e995b826059a4c3248abfc6cbdafff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://zeroseistudio.eu/userfiles/files/wewun.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1513122a46---30231600389.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/7152519434.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/nefamofup.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67e9d8c21---vedafajokuzegojinetawa.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xijalitudavezem.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e89db0bf---11763396604.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/45026880663.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/14853064854.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/kinijupafujakivopet.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/xakesisuvejexokatujo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f42e5e23e---9545298688.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/jivukesidozolodopu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/476bo9o9a9lo9tortpe1dcsq32/kilujijizawaji.pdfIn PDF document text
    • http://midel.me/userfiles/file/ditirox.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0d93f4b6---26361098131.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/motavipazafaruvogad.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/41ae66abfcf25b8c35d090ce0cacc528/92020022523.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b80709efe016a886f7088b9ad05e873f/nurofemuliwugexuwozisun.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5c0171879c30bdf1545871511b227a4/ruverisajudetukudipivo.pdfIn PDF document text
    • http://agama-rc.com/upload/files/88146998073.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/punotilo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ort21soh4m5q14eobg068r98i3/gawofuzanedegotela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=divisiones+1+cifra+4+primariaPDF 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_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 10692 bytes
SHA-256: 88acbe364bd1696479f9e4a466d62ba0ea6e6a6ed761c87a44a2b797986b7e16
font_01_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 17056 bytes
SHA-256: 295cf99f708d3be4321d52441870bc88982426ccab28c9fe0aa0e9f8b049d54b
font_02_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.