Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad4809c665462fa…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 17:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 68d8c9a8761b7a73fb96fa88a22d5d47 SHA-1: ac5ad559c4d3dcba79efc5b2cccd4dea79722f1b SHA-256: 8ad4809c665462fa43323b615d8b1d1729ae943456f95d0c2859b1d5cf7e676e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF link farm heuristics and embedded URLs points towards an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://birons.net/wp-content/plugins/super-forms/uploads/php/files/7a4c86ed944973bf20abdbce7a8883d6/31249869304.pdf In PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210722_773BFCBEFA61D301.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/87285719843.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/6j6eleppgm2i1s6sj4r4o9rtlb/kumajarepazavedaxiliwer.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/5098298960.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/65291d326b1f8967e58965d23e2c39b2/dumirulipuwegirurezil.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/besupumupusavi.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/sobakazezokabibadivubazox.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/lebuketizekasozax.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4c864fbc45f762b809e582e455155ea2/falela.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/loruvejinu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tezuwuxanevofitalabes.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/keratonukiz.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/79506754353.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/rajopujolubadeguxo.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/felasagosezamaz.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/55470406140.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9216dd0d0---dovajavepowaf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/76hta28bve5228c6efagqeau83/45060887057.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/xemufomeparatibuvu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/33455298826.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/13617270627.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/37894850799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hydraulic+pump+service+manual+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 16188 bytes
SHA-256: 70848542ce0e5665dfe8964f0bc528dba7407ebed477cf03135693db36fecbd8
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 10836 bytes
SHA-256: 7fb5e912567c32ea24e6e0f82b99d390f342dce54c6704a0ecf86b6afb3c8592
font_02_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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